Question

integration of x cos x dx​

Answer 1

Integration by Parts is a special method of integration that is often useful when two functions are multiplied together, but is also helpful in other ways.

You will see plenty of examples soon, but first let us see the rule:

∫u v dx = u∫v dx −∫u' (∫v dx) dx

u is the function u(x)

v is the function v(x)

u' is the derivative of the function u(x)