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  • 8/13/2019 Advanced Engineering Mathematics Solutions (6-1~6-7&Ch6review)

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    Solution 6-1~6-7 and Ch6 review

    Solution 6-1 No. 6

    t et f t 4sinh {f(t)}

    2

    53

    2

    444sinh

    t et et et et t et e

    534538

    215335

    215131212

    53

    s s s s s s s s

    s s

    t et e

    No. 11

    bt

    bt t t f

    ,0

    0 ,

    2

    0002

    020

    s

    e se

    s

    bse s

    bsbeb

    t s

    st e s

    st tebt

    st dt tet f

    21

    2 s s

    bse s

    bsbe

    No. 22

    Since 0 101

    2

    1

    21 t t t t t dt edt t e

    Set st then sd

    s dt t ,

    s s sd

    st t

    st t

    d eedt e

    1011

    01

    01

    Remark: 0

    1 lim,t t

    t f t f kt Met f cannot be met.

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    No. 26

    ,25215

    s

    s s F find t f

    1

    s F 1

    6.254.2

    56.2

    s s 1

    4.251

    s 1 t t

    s ee55

    51

    4.26.2

    No. 32

    ,1

    b sa s s F find t f

    If ab 1 ab

    s F 1 1 b sa s

    11 bt at ab ee 1

    If ab 1 s F 1

    at

    a ste

    21

    No. 43

    ,10422

    76

    s s

    s s F find t f

    1 s F 1 8212

    76

    s

    s 1

    421

    273

    s

    s 1

    2221

    2113

    s

    s

    1

    t et e t t

    s s

    s2sin2cos3

    4

    1

    2221

    241

    2221

    13

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    Solution 6-2 No. 4

    00' ,00 ,109"

    y ye y y t

    Set sY t y

    ,1

    109" s

    y y 1

    109)0(')0()(2 s

    sY y sy sY s

    Insert 00',00 y y

    1

    1092

    s sY s

    232

    31

    23211

    921

    9211

    921

    11

    92110

    s s

    s s s s

    s s s

    s s s s

    sY

    t y -1 t t t e sY 3sin313cos

    No. 12

    52' ,32 ,03'2"

    y y y y y Set yt y y y y yt ~ ,0'~2',0~20,2t,2 t,2

    Let sY t y , sY y ~~~

    0~~3)0(~)~(~~2)0('~)0(~)~(~~ 2 sY y sY s y y s sY s Substitute 50'~ ,30~ y y into the above equation

    0~~33)~(~~25~3)~(~~ 2 sY sY s s sY s 11~3)~(~3~2~ 2 s sY s s

    3~21

    1~27

    3~22~11~3)~(

    ~ s s s s

    s sY

    )(~ y 1 32127)~(~ ee sY

    Restore 2t

    23212

    27 t t eet y

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    No. 25

    422

    1

    s s s F

    And 1 t s 2

    2

    4221 sin

    Then 1

    t t d t t s s 22

    422

    402

    20

    22

    2

    4221 cos11coscossin

    No. 29

    a s sas s

    s F 2

    123

    1

    And 1 at a s e 1

    Then 1

    aat et

    a

    aet aa s s d e

    1

    00

    1

    1

    t

    a

    aet aa

    ae

    a s sd

    00

    11

    21

    2111

    a

    at eat

    a

    at ea

    t

    a sa

    s

    a sa

    a sa

    s

    a sa

    a s sas s 2

    1

    2

    121

    21

    2

    12

    1

    21

    231

    -122

    123

    1

    a

    at eat

    aas s

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    Solution 6-3 No. 4

    t t t f 0 ,2cos t ut t tut tut tut ut ut t f 2cos2cos2cos2cos2cos

    s s

    s s se

    s s

    s se

    s s et f

    s s 144422 2222222

    No. 8

    21 2 t t t f

    212 t ut ut t f

    21 22 t ut t ut

    2424211121 22 t ut t t ut t

    2422422111211 22 t ut ut t ut t ut ut t ut

    s

    e se

    se

    se

    se

    se s s s s s st f

    2

    2

    2

    3

    2

    234222

    No.16

    4/2 23 seet f s s

    s s s s s s s s se se

    eeee 32

    2132

    21

    22

    32

    3131 3212213212

    21 t uet uet uet uet f t t t t

    31 3232211212

    21 t ueet uee t t t t

    332sinh112sinh t ut t ut

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    No. 28

    R = 1 k , L = 1 H, 0v if t 0 and V t sin40 if t )(sin40)()(')( t tut vt Lit Ri

    t ut t tut vii )sin(40)(sin40)('1000

    0)0(:0100012

    40 ii s sI s I s

    se

    se s s

    s s s

    e s I s

    e s I s s s

    10001

    110

    11040

    1100040;

    1401000

    2

    3

    622

    t uet t t i t 1000

    1610

    40 sin1000cos

    t u

    t et t t i 1000sin1000cos1610

    40

    0 t ii

    t et t t iii 1000cossin1000

    11040 6

    No. 32

    0,10,10 2 v F C R if 4t and V e t 1014 36 if 4t

    )(t vt Ri C t Q

    410144101410010 43126036 t ueet uet vd ii t t t

    3

    4126101410010 s

    see s

    s I s I

    34125101410

    3

    4125101410 ;1 s

    see

    s s

    s

    see

    s s I s I

    s

    s s s s

    s see ee s I 41253

    610

    20310

    41251014 10

    46201043410125

    t ueeet i t t

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    4 ,361028205104364102012510

    40 ,0 t t et eet et eet iii

    t t ii

    No. 35

    oterwise ,0

    3 , cos9900 F10C ,1 2

    t V t t v H L

    3cos9900cos99003cos9900 t tut tut ut ut t v 33cos9900cos9900 t ut t ut

    t vC

    t qt Li )(' t vd it i t 0100)('

    d it i t

    0100' t v

    12

    39900

    1299001000

    s

    s se

    s

    s se s

    s I i s sI

    s I t i 00 i

    12

    39900

    129900

    1002

    s

    s se

    s

    s se s

    s I s

    100212

    329900

    100212

    29900)( s s

    se s

    s s

    se s s I

    s

    s s

    s

    s see 3

    100210000

    12100

    100210000

    12100

    t i 1 s I 3310sin10003sin10010sin1000sin100 t ut t t ut t

    t i 0 0t i 3 t ii t t t t t i 10sin1000sin10010sin1000sin100 3 t iii

    310sin10003sin10010sin1000sin100 t t t t t i 010sin1000sin10010sin1000sin100 t t t t

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    oterwise ,0

    3 , cos9900 F10C ,1 2

    t V t t v H L

    1 )(' t vC

    t qt Li t

    ;2

    2t i L

    dt t dq

    dt t dv

    C dt

    t dq

    dt

    t id

    Or 2 100

    2

    2

    dt t dv

    dt

    t id t i

    3cos9900 t ut ut t v

    33sin9900sin99003sin9900 t ut t ut t ut ut dt

    t dv

    Transform both sides of (2)

    12

    39900

    1299001000'02

    s

    se

    s

    se s I i si s I s

    t v t 3 , 9900,0

    vv

    03,99003

    vv

    dt

    t dv Laplace transformation

    t sevv sedt

    dt dv st e ;9900

    3 ;3990033333

    t sevv sedt

    dt dv st e

    se se s

    se

    s

    se s I i si s I s 399009900

    12

    39900

    1299001000'02

    From (1) At t 0 0000 v L C

    qdt

    di

    Since 00' 00

    iq and 00 i

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    se s

    se s

    s I s 3112

    1990012

    1199001002

    se s s

    se s s

    s I 3112

    11002

    990012

    111002

    9900

    s

    s

    s

    s

    s

    s

    s

    see 3

    12

    2

    10029900

    12

    2

    10029900

    s s s

    s

    s see s I 3

    100210000

    12100

    100210000

    12100

    t i 1 s I

    3310sin10003sin10010sin1000sin100 t ut t t ut t

    t i 0 0t i 3 t ii t t t t t i 10sin1000sin10010sin1000sin100 3 t iii

    310sin10003sin10010sin1000sin100 t t t t t i 010sin1000sin10010sin1000sin100 t t t t

    No. 39

    2 t ,0

    20 , 1000 F5.0C ,1,2R

    t V t v H L

    t vC

    t qt Ri

    dt t di

    L Or 1 022 t vt d i I

    dt t di

    21000 t ut ut v Laplace transform on both side of 1

    s

    se s s

    s I s I i s sI

    2110002

    20 s I t i 00 i

    s

    se s s

    s I s s 211000222

    222

    2

    222

    11 0 0 0

    s s

    se

    s s

    s I

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    121

    2

    121

    11000 s

    se

    s s I

    t i 1

    22sin2

    1000sin1000

    t ut t

    et t

    e s I

    20 t i t t et i s i n1000

    t ii 2s i n21 0 0 0s i n1 0 0 0 t t et t et i

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    Solution 6-4

    No. 3 0(0)y' ,2y(0) ,29" t y y

    Make Laplace transformation on both sides of the equation

    0(0)y' ,2y(0) ;90'0 22 s

    e sY y sy sY s

    are then inserted

    se s sY s 22 29

    92

    2

    922

    s

    se

    s

    s sY

    t y 1

    23cos313cos2223sin313cos2 t tut t ut t sY

    92

    2

    922

    s

    se

    s

    s sY

    t y 1 d t t sY t 0 23

    1 3sin3cos2

    2

    0 t i t t y 3c o s2

    2 t i

    t t t t t y 3cos3cos23sin3cos231

    231

    No. 6

    se sY y s sY y sy sY s 5040'02

    3(0)y' ,0y(0) are then inserted

    se sY s sY sY s 5432

    se sY s s 3542

    1221223

    5425423

    s

    se

    s s s

    se

    s s sY

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    t y 1 11sinsin3 122 t ut et e sY t t

    1221223

    s

    se

    s sY

    t y 1 d t et e sY t t t 0

    2212 1sinsin3

    10 t i t et y t s i n3 2

    1t ii 1s i ns i n3 122 t et et y t t

    No. 9

    1000),2(212'2" 2 ) , y'( ) y( t eet u y y y t

    s s

    see s

    ee sY y s sY y sy sY s 221

    22

    112 2020'0

    1000 ) , y'( ) y(

    s s

    see

    s

    ee sY s sY sY s 22

    1

    22

    1

    12 221

    s s see

    s ee sY s s 22

    1

    22

    112 122

    222

    22

    2221

    22

    2221

    1

    2221

    s s

    see

    s s s

    see

    s s s s s sY

    222

    2222

    22253

    51

    151

    22253

    51

    151

    2221

    s s

    see s

    s s

    s

    s s s

    s

    s s see

    121

    2222

    121

    53

    51

    151

    121

    53

    51

    151

    121

    1

    s

    see s

    s

    s

    s s

    s

    s see

    121

    2222

    121

    521

    51

    151

    121

    521

    51

    151

    121

    1

    s

    see s

    s

    s

    s s

    s

    s see

    t y 1 sY

    2sincossin22

    51

    52

    51

    51

    t ueet et eet e t t t t t

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    )sincos3()sincos3()sincos2(sincos2( 333101222

    51 et t eeet t ee t t t t

    )(3103

    101)(2

    52

    51

    52)2

    1(3)21(2

    )sincos3(sincos t t t t et t et t ee

    )(3103)(2

    52

    101

    101)2

    1(3)21(2

    sincos)( t t t t eet t eet y

    No. 11 1000 ,2123" ) , y'( ) y( t t u y y y

    s s

    se e sY y s sY y sy sY s 22 2030'0

    1(0)y' ,0y(0) are then inserted

    s s

    se e sY s sY sY s 22 231

    s s se e sY s s 22 123

    21232 s s s s

    212

    21211

    s s

    se s s s

    se s s

    sY

    s

    s s s

    s s s s s ee2

    21

    11

    221

    112

    1

    21

    11

    t y 1 sY 21 22212

    211

    212 t ueet ueeee t t t t t t

    No. 125(0)y' ,2y(0)),(100255'2" t t y y y

    s s

    e sY y s sY y sy sY s 1005020'02

    252 5(0)y' ,2y(0)

    s s

    e sY s sY s sY s 100542522

    252

    s s

    e s sY s s 10012522

    252

    522

    100

    522225

    52212

    s s

    se

    s s s s s

    s sY

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    2221100

    252

    522100

    252

    522100

    52212

    252

    52212

    s

    se

    s s s s

    se

    s

    s

    s s

    se

    s s

    s

    s

    s

    s s

    s

    t y 1

    t ut et sY t

    2sin5052

    t tuet t 2sin5052

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    Solution 6-5

    No. 4

    d t t d t t t t t 02

    10 coscoscoscoscoscos

    d t t t 02

    1 cos2cos

    t t t 02

    121 cos2sin

    0sincossin2

    1

    2

    1

    2

    1 t t t t

    t t t t sincossin

    21

    21

    21

    t t t

    cossin121

    No. 6

    t ba baebt et babt t t babt at d eed eeee 000

    ba

    bt eat eba

    t baebt e 1

    No. 8

    t d t yt y t 24 0

    22

    04 s

    t d t yt y

    22

    214

    s s sY sY

    22241 s s sY 222 4

    2

    s s s sY

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    42

    2

    s sY

    t t y 2sin No. 9

    20 d yt y t

    s

    t d yt y 20

    s s

    sY sY 21

    s s

    sY 211 s s

    s sY 21

    1

    2 s

    sY

    t et y 2

    No.13

    t t t ted e yet y

    02

    211

    02 s

    t t d e yet y

    211

    02 s

    t t t t d e yeet y

    211

    112

    s s sY sY

    211

    121

    s s sY

    211

    11

    s s s sY

    11

    11

    21

    111

    s s s s sY

    t eet y t t sinh21

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    No.25

    2

    362

    18

    s

    s s F -1 t s

    6sin3362

    18 -1 t s

    s 6cos362

    -1

    t

    s

    s d t 02362

    18 6cos6sin3

    t d t t 023 666sin666sin

    t d t t 023 612sin6sin

    t t t 012123 612cos6sin

    t t t t 6cos6cos6sin121

    121

    23

    t t 6sin23

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    Solution 6-6

    No. 2

    t t t f 4sinh3

    2

    444sinh

    t et et

    162

    4

    1628

    21

    41

    41

    214sinh

    s s s st

    2162

    24

    2162

    241624

    334sinh3

    s

    s

    s

    s

    ds

    sd

    t t ds

    sdF t tf

    No. 6

    t t t f 3sin2

    9

    23

    23

    233sin

    s s

    t

    2

    92

    62323

    3sin

    s

    sds

    sd

    t t

    492

    922262

    926292

    6

    3sin2

    s

    s s s s

    ds

    s

    sd

    t t

    492

    2216424486210846

    s

    s s s s

    392

    3218

    492

    923218

    492

    4862108418

    s

    s

    s

    s s

    s

    s s

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    No. 14

    2162

    s

    s s F ds

    sd

    s

    s

    1621

    2

    1

    2162

    -1 t

    s4sin

    41

    1621 -1 t t t t

    s

    s 4sin814sin

    41

    21

    2162

    Or

    -1

    d t t t d t t

    s

    s

    0

    444sin444sin81cos0 4sin4

    12

    162

    t

    t t d t t t 0

    48cos814sin

    81

    0 48sin4sin81

    t t t t t t 4sin814cos814cos814sin81

    No.15

    2)42( s

    s s F

    ds s

    d

    s

    s 421

    21

    2)42(

    and2

    12

    141

    421

    s s s

    -1 t t

    see 22

    41

    421

    -1 t t t t ds s

    d

    eet eet 228122

    41

    2142

    1

    21

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    Or42

    1

    422)42( s s s

    s

    s

    21

    21

    21

    2242 s s s s s

    s

    s

    -1 t t s

    s ee 2221

    42

    And -1 t t s

    ee 2241

    421

    -1 d eeeet t t s

    s

    0)(2)(2

    4122

    21

    242

    d eeeet t t t t 0

    24242281

    t t t t t eeee0

    2424142

    412

    81

    t t t t t t teeeeete 22412

    412

    412

    412

    81

    t t tete 2281

    No.17

    1

    ln s

    s s F 1lnln1

    ln s s s

    s

    Set -1 )(

    1ln t f

    s s

    then,

    -1)(

    1ln

    t tf ds s

    sd

    ;

    -1

    ds s

    sd 1

    ln

    -1 )(111

    1 t tf t e s s

    t

    et f t 1

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    No.20

    b sa s s F ln b sa s

    b sa s lnlnln

    Set -1 )(ln t f b sa s then, -1 )(

    lnt tf ds

    d b s

    a s

    ;

    -1

    ds

    d b sa sln

    -1 )(11 t tf at ebt e

    a sb s

    )(1)( at ebt et

    t f

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    Solution 6-7

    No. 2

    00 ,10 ,cos2 ,0 21'212'1 y yt y y y y

    Writing ,11 sY y sY y 22

    10 211 sY y s sY

    12

    2221 0

    s

    s y s sY sY Replace 00,10 21 y y

    121 sY s sY 1

    122

    21 s

    s s sY sY 2

    1 s 2 12

    21

    2 1 s

    s s sY s

    2

    12

    2

    121

    s

    s

    s

    s sY

    Then from 1 21222

    121

    21222

    122

    12 11

    s

    s s s

    s s

    s s sY sY

    Using (3) of sec.6.6 -1 t t

    s

    s

    sin2222

    t t t t t t y t sincossincos22

    1 In this case 1

    And using (4) of sec.6.6 -1 t t t s

    s

    cossin21

    222

    2

    t t t t t t t t t t t y coscossinsincossinsin22

    2 In this case 1

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    No. 4

    30 ,00 ,4sin93 ,4cos84 211'22'1 y yt y yt y y

    Writing

    ,11 sY y

    sY y 22

    162

    8211 40

    s

    s sY y s sY

    162

    36122 30

    s sY y s sY Replace 30,00 21 y y

    162

    821 4

    s

    s sY s sY 1

    16

    236

    21 33 s

    s sY sY 2

    1 s 2 4 162

    144

    162

    281

    2 1212 s s

    s sY s

    162

    144192212281

    2 12 s

    s s sY s 162

    1224

    1624824

    12 12

    s

    s

    s

    s sY s

    162

    41

    s sY

    1

    3 2

    s

    162

    2123

    162

    3336

    16236483324

    16236

    16224

    22 312

    s

    s s

    s

    s s

    s

    s s s s

    s

    s

    s

    s s sY s

    162

    32

    s

    s sY

    t t y 4sin1 t t y 4cos32

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    No. 6

    30 ,10 ,5 ,5 2121'221'1 y y y y y y y y

    Writing

    ,11 sY y

    sY y 22 sY sY y s sY 2111 50 sY sY y s sY 2122 50 Replace 30,10 21 y y 15 211 sY sY s sY 15 21 sY sY s 1 35 221 sY s sY sY 35 21 sY s sY 2

    1 ( s 5) 2 3515 12 s sY s

    6

    1

    4

    2

    24102

    8

    1

    s s s s

    s sY

    1 +2 ( s 5)

    163153151 22 s s sY s

    6

    14

    2

    24102163

    2

    s s s s

    s sY

    t t eet y 641 2

    t t eet y 642 2

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    No. 8

    30 ,40 ,4 ,32 2121'221'1 y y y y y y y y

    Writing

    ,11 sY y

    sY y 22 sY sY y s sY 2111 320 sY sY y s sY 2122 40 Replace 30,40 21 y y 432 211 sY sY s sY 432 21 sY sY s 1

    34 221 sY s sY sY 314 21 sY s sY 2 1 ( s 1) 2 3 9441212 1 s sY s s

    5

    12

    3

    1032134

    1

    s s s s

    s sY

    1 4+2 ( s 2)

    22363161212 2 s s sY s s

    5

    12

    4

    1032223

    2

    s s s s

    s sY

    t t eet y 521 3

    t t eet y 522 4

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    No. 12

    00 ,20 ,00 ,10 ,2 ,54 '22'1121"221"1 y y y y y y y y y y

    Writing

    ,11 sY y

    sY y 22

    sY sY y sy sY s 21'1112 5400

    sY sY y sy sY s 21'2222 200 Replace

    00 ,20 ,00 ,10 '22'11 y y y y

    s sY sY s 21

    2 54 1

    s sY s sY 22 221 2

    1 22 s 2 5 s s s sY s s 102542 2122

    s s sY s s 832 3124 s s sY s s 831 3122

    3245

    189

    189

    3245

    1249

    321283

    1

    s

    s

    s s s

    s

    s

    s

    s s

    s s

    sY

    1 2 42 s 42245 2222 s s s sY s s s s sY s s 7232 3224

    s s sY s s 7231 3222

    32

    41

    189

    189

    3241

    1249

    3212732

    2

    s

    s s s s

    s

    s

    s

    s s

    s s sY

    t t t eet y t t 3coscosh3cos45

    49

    45

    89

    89

    1

    t t t eet y t t 3coscosh3cos41

    49

    41

    89

    89

    2

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    No.13

    60 ,80 ,60 ,00 ,10sin101 ,10sin101 '22'111"22"1 y y y yt y yt y y

    Writing

    ,11 sY y

    sY y 22

    1002

    10102

    '111

    2 00 s

    sY y sy sY s

    1002

    10101

    '222

    2 00 s

    sY y sy sY s Replace

    60 ,80 ,60 ,00 '22'11 y y y y

    1002

    101021

    2 6 s

    sY sY s 1

    1002

    10102

    21 68

    s s sY s sY 2

    1 2 s 2 1002

    10102

    10021010

    14 6861

    s s s s sY s

    s s sY s s

    s 811 2100241026

    14

    12

    4

    124

    100210

    124

    12128

    12100241026

    1 s

    s

    s

    s

    s s s s

    s

    s s

    s sY

    124

    100210

    12

    12

    12

    12

    124

    100210

    124

    124

    s

    s

    s s s s s s

    s

    s s

    s

    s

    124

    100210

    14

    s

    s

    s s

    1 2 2 s 210021010

    10021010

    24 6861 s s sY s

    s s

    s s sY s s

    8161 21002

    10102

    4

    12

    4

    100210

    14

    12128

    12100241026

    2

    s

    s

    s s s s

    s

    s s

    s sY

    t t et y t cos410sin41

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    t t et y t cos410sin42

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    Solution Ch6 review No.13

    No.21

    No.25

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    No.38

    No.39

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    No.44