Question

please give hint (0/0form ) to solve it

Answer 1

You can use l'hopital's rule i.e if numerator(X) and denominator(Y) result in 0/0 form

then

$\lim_{x \to k} \frac{X}{Y} = \lim_{x \to k} \frac{dX/dx}{dY/dx}$

So evaluating the RHS term gives us answer.

If that is also in 0/0 form, continue with the same process till you find other than 0/0

(L'hospitals rule is used only for 0/0 i.e indeterminate forms)