1.

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

Answer»

f is EVERYWHERE DIFFERENTIABLE
f is everywhere continuous but not differentiable at `x= n pi, n in Z`
f is everywhere continuous but not differentiable at `x= (2n + (pi)/(2)), n in Z`
NONE of the above

Answer :B


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