Q3 of 61 Page 204

Prove the following identities.

Consider RHS,


RHS =


We know that sin (90° - θ) = cosθ.


⇒ =


We know that 2cos2θ – 1 = cos2θ – sin2θ


⇒ =


Multiplying and dividing by cos2θ,


⇒ =


= = LHS


Hence proved.


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