Verify the identity Cos^2x-Sin^2x=1-2sin^2x

asked Aug 9, 2015 136k views

2 votes

Verify the identity
Cos^2x-Sin^2x=1-2sin^2x

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$cos^2x-sin^2x=1-2sin^2x\\\\\\R=1-2sin^2x=cos^2x+sin^2x-2sin^2x=cos^2x-sin^2x=L\\\\\\\\\\sin^2x+cos^2x=1$

PersianLife answered Aug 15, 2015

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