Question: Determine whether Rolles Theorem can be applied to f on the closed interval [a, b]. If Rolles Theorem can be applied, find all values of

Determine whether Rolle’s Theorem can be applied to f on the closed interval [a, b]. If Rolle’s Theorem can be applied, find all values of c in the open interval (a, b) such that f′(c) = 0. If Rolle’s Theorem cannot be applied, explain why not.

f(x) = cos x, [π, 3π]

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