Find the value of the derivative (if it exists) at each indicated extremum. (If an answer does not exist, enter DNE.) f (x) = cosπx/2

asked Oct 25, 2018 114k views

5 votes

Find the value of the derivative (if it exists) at each indicated extremum. (If an answer does not exist, enter DNE.)

f (x) = cosπx/2

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4 votes

The derivative of cos(ax) is
-a*sin(ax)
So here we have a=pi/2 so
d/dx(cos(pi*x/2))=-(pi/2)sin(pi*x/2)

Yeny answered Oct 31, 2018

by Yeny

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