johndonut johndonut
  • 16-02-2017
  • Mathematics
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express cos^2x in terms of cos2x

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Safsafsofia
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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