1.

If \[f(x)=\cos x,0\le x\le \frac{\pi }{2}\], then the real number ?c? of the mean value theorem is                                 [MP PET 1994]

A.            \[\frac{\pi }{6}\]
B.            \[\frac{\pi }{4}\]
C.            \[{{\sin }^{-1}}\left( \frac{2}{\pi } \right)\]
D.            \[{{\cos }^{-1}}\left( \frac{2}{\pi } \right)\]
Answer» D.            \[{{\cos }^{-1}}\left( \frac{2}{\pi } \right)\]


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