(c)

Step 1:

The integral is .

Sum rule of integration: .

Consider

Assume

Differentiate with respect to .

Substitute and in the integral.

Power rule of integration: .

Replace in above expression.

.

Step 2:

Consider .

Assume

Differentiate with respect to .

Substitute and in the integral.

Replace in above expression.

.

Substitute the results of  and in .

.

Solution:

(d)

Step 1: 

The integral is .

Assume .

Differentiate with respect to .

Substitute and in the integral.

Power rule of integration: .

.

Replace in above expression.

.

Solution: