Diketahui sin 15 = a,tentukan nilai trigonometri dalam bentuk a:
a.sin 75
b.cotan 15
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sin 75 = sin (90-15)
= cos 15 = 1-a2= akar 1-a^2
cotan 15 = 1/tan 15
= a/1-a2= a/akar 1-a^2
cotan 15 = x/y : a/