Thursday 22 March 2012


 Double angles
1.sin2x=2sinxcosx=2tanx/1+tan2x
2.cos2x=cos2x-sin2x
              =2cos2x-1=1-2sin2x
              =1-tan2 x/1+ tan2 x
3.tan2x=2tanx/1-tan2x        

                     

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