Evaluate the integral:

Key points to solve the problem:

• Such problems require the use of the method of substitution along with a method of integration by parts. By the method of integration by parts if we have

• To solve the integrals of the form: after applying substitution and integration by parts we have direct formulae as described below:

Let, I =

We have:

I =

⇒ I =

As I match with the form:

∴ I =

⇒ I =