Math, asked by lalitkumar2470, 1 year ago

cos 3x+cos 7x-cos 2x/sin 7x-sin 3x-sin 2x=cot 2x

Answers

Answered by sandy1816

14

Step-by-step explanation:

cos3x+cos7x-cos2x/sin7x-sin3x-sin2x

=2cos5xcos2x-cos2x/2cos5xsin2x-sin2x

=cos2x(2sin5x-1)/sin2x(2sin5x-1)

=cos2x/sin2x

=cot2x

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