Hi srini 202, welcome to MHF.
According to forum rule we cannot provide the answer to any problem. We can only give some hints. You have to solve the problem.
Now to the problem:
I hope you know the differentiation.
So find the first and second derivative of y = sin(sinx). In the second derivative, you get two terms in the answer. Remaining term you have to get using the first derivative. Show these steps.