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OpenStudy (anonymous):
Find the value of the derivative (if it exists) at each indicated extremum. (If an answer does not exist, enter DNE.) f (x) = cos(πx/2) at f prime of 0 and 2
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OpenStudy (anonymous):
Having an extremum at some point \(x=a\) is indicative of having \(f'(a)=0\).
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