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Derivative of sin11xcos11x

Verified Answer :

ghanami

Hello here is a solution :
f'(x) =( sin11x)'cos11x +sin11x(cos11x)'
(sin(ax+b))'=a cos(ax+b)
(cos(ax+b))'=-a sin(ax+b)
f'(x) = 11 cos11xcos11x-11sin11xsin11x
f'(x) = 11(cos11x)²-11(sin11x)²


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