Step 1:

 The integral is .

Let .

Apply derivative on each sid with respect to .

.

Step 2:

Substitute and in integral.

Substitute .

.

.

Solution:

.

(2)

Step 1:

The integral is .

Let

Apply derivative on each side with respect to .

.

Substitute and in the integral.

Let .

Apply derivative on each side with respect to .

.

Substitute and in .

Substitute .

Substitute .

.

.

Solution:

.