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Find the value of the derivative (if it exists) at the indicated extremum. (If an answer does not exist, enter DNE.) f(x) = x2 x2+4 f'(0) =

Find the value of the derivative (if it exists) at the indicated extremum. (If an answer does not exist, enter DNE.) f(x) = x2 x2+4 f'(0) =

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Find the value of the derivative (if it exists) at the indicated extremum. (If an answer does not exist, enter DNE.) f(x) = x2 x2+4 f'(0) =

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