What is (sin^(2) x- cos^(2) x) equal to ...

What is `(sin^(2) x- cos^(2) x)` equal to ?

A

`sin^(4) x - cos^(4) x`

B

`sin^(6) x - cos^(6) x`

C

`cos^(8) x - sin^(8) x`

D

`sin^(8) x - cos^(8)` x`

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