Q12 of 116 Page 849

If , find .


Formula:


Using double angle formula:


2cos2x – 1


= 1 – 2 sin2 x


∴1 + cos 2 x = 2cos2x


1 - cos 2 x = 2sin2x


∴


=


= cotx


Differentiating y with respect to x


=


- cosec2 x


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