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Matematika SMA Kelas XI
Gunakan rumus sin (A+ B) = sin A.cos B + cos A.sin B
⇔ sin (x + y) = sin x.cos y
⇔ sin x.cos y + cos x.sin y = sin x.cos y
⇔ cos x.sin y = sin x.cos y - sin x.cos y
∴ cos x.sin y = 0