first apply integration by parts in x2/sin2x dx then u will get xcotx in integral...
and its solution is here as under....
Na pine ka shouk tha na pilane ka shonk tha. Hume to sirf NAZREIN milane ka shonk tha. Par kya karen hum nazre hi unse mila baithe jinhe nazron se PILANE ka shonk tha.