Shivani Thakur , asked a question
Subject: Math , asked on 14/3/11

 what is the derivative of cos3x????????????????

Sr , added an answer, on 14/3/11
103 helpful votes in Math

d/dx (cos 3x) =  d/dx (cos 3x) .d/dx (3x)  (by using chain rule )

  =  (- sin 3x) (3)

  = -3 sin 3x

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