Q2 of 285 Page 370

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

cos 5x


Formulae :


•


•


Let,


y = cos 5x


and u = 5x


therefore, y= cos u


Differentiating above equation w.r.t. x,


………… By chain rule



………….


= - sin 5x . 5


= - 5 sin 5x


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