Buku Matematika SMK Kelas X
Bab Trigonometri
Kasmina | Toali
1. Jika cosec α = 3 dan α terletak di kuadran I, nilai cos α = ...
a. 8/9
b. 4.9
c. 2/3 √2
d. 1/4 √2
e. 1/9 √2
Jawaban : C
cosec α = 3
miring / depan = 3/1
miring = 3
depan = 1
samping = √(32- 12)
samping = √8 = √4 √2 = 2√2
cos α = samping / miring
cos α = 2√2 / 3
cos α = 2/3 √2
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