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Trigonometric  Identities

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☼   Trigonometric  Identities : –

cos2 θ +  sin2 θ  =  1

∴     1  –   cos2 θ  =  sin2 θ

∴     1  –   sin2 θ   =  cos2 θ

sec2 θ  –  tan2   =   1

   ∴  sec2 θ  –  1  =   tan2 θ

   ∴ 1  +  tan2 θ  =   sec2 θ

cosec2 θ  –  cot2 θ  =  1

  ∴  cosec2 θ  –  1  =   cot2θ

  ∴  1  +  cot2 θ  =   cosec2 θ

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