johndonut
johndonut
16-02-2017
Mathematics
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express cos^2x in terms of cos2x
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Safsafsofia
Safsafsofia
16-02-2017
cos 2x = cos^2 x - sin^2 x
cos^2 x = 1 - sin^2 x
cos 2x = 1 - 2 sin^2 x
sin^2 x = 1/2( 1 - cos 2x)
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