Answer :

Given: L.H.S. =

Since we know

So L.H.S.

Multiplying Numerator & Denominator with sin θ - (1 - cos θ) we get



Since sin2 θ + cos2 θ = 1

Taking 2 common out of numerator and denominator 


L.H.S. = R.H.S.

Hence Proved

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