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Attempt following question by selecting a choice to answer.
D
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].
BBB  DDD
A.  D0
B.  Dπ4
C.  Dπ2
D.  D- π2
E.  Dπ6

DD