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If f(x) = |cos x|, then f'((pi)/(4)) is ...

If `f(x) = |cos x|`, then `f'((pi)/(4))` is equal to …… `0 lt x lt (pi)/(2)`

A

f is everywhere differentiable

B

f is everywhere continuous but not differentiable at `x= n pi, n in Z`

C

f is everywhere continuous but not differentiable at `x= (2n + (pi)/(2)), n in Z`

D

none of the above

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The correct Answer is:
B
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KUMAR PRAKASHAN-CONTINUITY AND DIFFERENTIABILITY-NCERT Exemplar Problems and Solution (Objective Type Questions)
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  3. The derivative of cos^(-1) (2x^(2)-1) w.r.t cos^(-1)x is

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  12. If f(x)= x^(2) sin ((1)/(x)), where x ne 0, then the value of the func...

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  13. If f(x) {(mx + 1,x le (pi)/(2)),((sin x)+ n,x gt (pi)/(2)):} is contin...

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  14. If f(x) = |cos x|, then f'((pi)/(4)) is equal to …… 0 lt x lt (pi)/(2)

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  15. If y= log ((1- x^(2))/(1+ x^(2))), then (dy)/(dx) is equal to

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  16. If y= sqrt(sin x + y), then (dy)/(dx) is equal to

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  17. The derivative of cos^(-1) (2x^(2)-1) w.r.t cos^(-1)x is

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  18. If x= t^(2) and y= t^(3), then (d^(2)y)/(dx^(2)) is equal to

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  19. The value of c in Rolle's theorem for the function f(x)= x^(3) in the ...

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  20. For the function f(x)= x + (1)/(x), x in [1, 3] the value of c for mea...

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