Q. 305.0( 3 Votes )

Differentiate each of the following w.r.t. x:

cos 4𝓍 cos 2𝓍

Answer :

Formulae :


•


•


•


•


Let,


y = cos 4x. cos 2x



………….



Differentiating above equation w.r.t. x,



………….


………….


= -3 sin 6x – sin 2x


= - (3 sin 6x + sin 2x)


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