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Shivani Thakur from Delhi Public school,Korba , asked a question
Subject: Math , asked on 14/3/11

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

Sr , From Delhi Public School , added an answer
Answered on 14/3/11

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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$@nch!t@ <3 <3 , From Mystry Mystry!! , added an answer
Answered on 19/3/11

d(cos3x)/dx= -sin3x.3

thus,d(cos3x)/dx=-3sin3x

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