sin^2x + cos^2x = 1
DESCRIPTION
TrigonometriTRANSCRIPT
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sin2 + cos2 = 1TRIGONOMETRI
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APA YANG ADA DIPIKIRANMU KETIKA MENDENGAR KATA TRIGONOMETRI?
SEGITIGA
SUDUT
SIKU-SIKU
SINTAN
COS
RADIAN
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A
B C
bc
a
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A
B C
bc
a
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Contoh
Jika diketahui = 150. Apakah sin22 + cos22 = 1 ?
Jawab :
= 150
2 = 300
sin22 + cos22 = sin2 300 + cos2 300
= 1
Jadi, sin22 + cos22 = 1.
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KERJAKAN SOAL BERIKUT INI!
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1. Apakah rumus sin2 + cos2 = 1 berlaku untuk soal berikut ini?
a.
12
5
b. cos = 6/10
c. tan2 = 9/16
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2. Jika cot x = 15/8, carilah cos2x!
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3.
10 x
y
Tunjukkan bahwa sin2 + cos2 = 1!
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sin2 + cos2 = 1
cos2 = 1 – sin2
KESIMPULAN
sin2 = 1 – cos2