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How do you find the derivative of #cos(pi x)#?

1 Answer

Aug 14, 2018

#(dy)/(dx)=-pisin(pix)#

Explanation:

Let,

#y=cos(pix)#

Using Chain Rule :

#:.(dy)/(dx)=-sin(pix)d/(dx)(pix)#

#:.(dy)/(dx)=-sin(pix)(pi)#

#:.(dy)/(dx)=-pisin(pix)#

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