Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

@username could you plz quote the source of q?

i can only say since f is differentiable, so at each point f’ finite, so in option B/D numerator is finite, but denom is infinite so limit is zero.

@harish-r how the last two steps?

@harish-r how do you get ln in denom?