Trigonometry ,sin2x,cos2x,tan2x ,cot2x formula,some important formulae of trigonometry

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Sin 2x, Cos2x, Tan2x, Cot2x formula, important formulae of trigonometry
  1. Pintoo Rao sir
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Trigonometry ,sin2x,cos2x,tan2x ,cot2x 0:09:25

Trigonometry ,sin2x,cos2x,tan2x ,cot2x formula,some important formulae of trigonometry

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Prove that Cos(2x)*Cos(x/2)-Cos(3x)*Cos(9x/2)=Sin(5x)*Sin(5x/2) 0:05:53

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