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Attempt following question by selecting a choice to answer.
B
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].
cc   BB
A.  B0
B.  Bπ4
C.  Bπ2
D.  B- π2
E.  Bπ6


B