Q. 83.5( 2 Votes )

Prove that: <span

Answer :



Using the identity 1+ cos2x = 2cos2x & 1– cos2x = 2sin2x


Considering the interval,


Dividing by 2



In this interval is positive and is negative, so comes out with negative term, see below



Dividing the numerator and denominator both by , we get







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