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Kuadran IV
sin^2 α = 1 - cos^2 α
sin^2 α = 1 - (15/17)^2
sin^2 α = 1 - 225/289
sin^2 α = 64/289
sin α = - 8/17
kuadran IV
maka nilai tanα
= sinα/cosα
= -8/17 / 15/17
= -8/15 (B)