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What ( sin x cos y + cos x sin y) (sin x...

What `( sin x cos y + cos x sin y) (sin x cos y - cos x sin y)` equal to ?

A

`cos^(2) x- cos^(2)y`

B

`cos^(2) x- sin^(2) y`

C

`sin^(2)x-cos^(2)y`

D

`sin^(2) x - sin^(2)y`

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