i need help with these 10 questions

YOU NEED TO ANSWER ALL

OTHERWISE, I WILL REPORT

THANKS

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Find the value of the derivative (if it exists) at each indicated extremum. (If an answer does not exist, enter DNE.) f (x) = cos IX 2 f '(0) = f '(2 ) = 2-+ (0, 1) X 3 -1 (2, -1) -2+Find the critical numbers of the function. (Enter your answers as a comma-separated list.) h (x) = sin2 x + cos x 0