1.

Prove that 1/sec 2theta = cos^4 - sin ^4​

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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