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)
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| Double angle formula for sinA.cosA and tan A |
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