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Alex
3 years ago
8

Prove (sinxsiny-cosxcosy)(sinxsiny+cosxcosy) =sin^2x-cos^2y

Mathematics
1 answer:
3241004551 [841]3 years ago
7 0

Step-by-step explanation:

Recall that \sin^2x + \cos^2x = 1

(\sin x \sin y - \cos x \cos y)(\sin x \sin y + \cos x \cos y)

= \sin^2 x \sin^2 y - \cos^2 x \cos^2 y

= \sin^2 x (1 - \cos^2 y) - \cos^2 x \cos^2 y

= \sin^2 x - \sin^2 x \cos^2y - \cos^2x \cos^2y

= \sin^2x - (\sin^2x + \cos^2x)\cos^2y

= \sin^2x - \cos^2y

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