Asked by Ashlynn
how does 2cos^2 x - 2sin^2 x = 2cos2x
Answers
Answered by
Reiny
divide both sides by 2
and you end up with the definition of
cos 2x = cos^2 x - sin^2 x
and you end up with the definition of
cos 2x = cos^2 x - sin^2 x
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