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Attempt following question by selecting a choice to answer.
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Use Rolle's Theorem to determine the value of c such that f ′ (c) = 0, if f(x) = cos x in the interval [- π2, π2].
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A.  f0
B.  fπ4
C.  fπ2
D.  f- π2
E.  fπ6

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