Hi,

How to integrate x^2/(xsinx + cosx)^2.

I am clueless. It does not fit into any formula straight away. If I want to try integration by parts, it appears to be lengthy and i do not know whether it will lead to the answer. How to go about this? do we have any particular method for solving such type of sums.

whether integration within integration is permissible. If so, when it is applicable / possible.

Any guidance welcome.

with warm regards,

ARANGA