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The greatest value of `f(x)=cos(x e^([x])+7x^2-3x),x in [-1,oo],` is (where [.] represents the greatest integer function). `-1` (b) 1 (c) 0 (d) none of these

A

-1

B

1

C

0

D

cos1

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The correct Answer is:
B
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OBJECTIVE RD SHARMA-MAXIMA AND MINIMA -Exercise
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  20. Let f(x) be a function such that f'(a) ne 0 . Then , at x=a, f(x)

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