Tuesday, October 23, 2012

Double angle formulas of sinA, Cos A and tan A



Double angle formulas of  sin 2A , Cos 2A and tan2A 

             sin(2A)   = 2sinAcosA
             cos(2A)  = 2cos^2A- sin^2 A 
             cos(2A)  = 1- 2sin^2A
             cos(2A)  =  2cos^2A - 1 
             tan (2A)  =  2tanA / (1- tan^2A)

Double angle formula for sinA.cosA and tan A

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