Q. 5 F5.0( 1 Vote )

Prove the following :cos60° = 2cos230° – 1 = 1 – 2 sin230°

We know that,

Taking LHS = cos 60°

Now, solving RHS = 2cos2 30° - 1 , we get

= RHS

Now taking RHS = 1- 2sin2 30°

= RHS

Hence, proved.

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