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Prove that 1/sec 2theta = cos^4 - sin ^4 |
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Answer» -step explanation:LHS =cos 4 θ−sin 4 θ=(cos 2 θ−sin 2 θ)(cos 2 θ+sin 2 θ)=(cos 2 θ−sin 2 θ)(1)=cos2θ⇒ LHS = RHS HENCE proved |
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