Determine whether Rolle's Theorem can be applied to f on the closed interval [a, b]. (Select all that apply.)
f(x) = cos x, [π, 3π]
Yes.
No, because f is not continuous on the closed interval [a, b].
No, because f is not differentiable in the open interval (a, b).
No, because f(a) ≠ f(b).
If Rolle's Theorem can be applied, find all values of c in
the open interval (a, b) such that f '(c) = 0.
(Enter your answers as a comma-separated list. If Rolle's Theorem
cannot be applied, enter NA.)
c =
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