Cos2x= A. cos^2x-1

B. 1-2cos^2x

C. cos^2sin^2x

D.1-2sin^2x

Please help.

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Cos2x= A. cos^2x-1 B. 1-2cos^2x C. cos^2sin^2x D.1-2sin^2x Please help.

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Cos2x= A. cos^2x-1

B. 1-2cos^2x

C. cos^2sin^2x

D.1-2sin^2x

Please help.