(1)

Step 1:

The integral is .

Sum and difference rule of integral : .

Power rule of integral formula : .

.

Solution :

.

(2)

Step 1:

The integral is .

Sum and difference rule of integral : .

Power rule of integral formula : .

.

Solution :

.

(3)

Step 1:

The integral is .

Domain :

All possible values of x is the domain of the function.

The domain of the function is .

Therefore the function is not continuous at .

Improper integrals :

If f is discontinuity at c, where , and both and are convergent.

Then .

Therefore the integraal is .

Step 2:

Consider .

Sum and difference rule of integral : .

Power rule of integral formula : .

.

Step 3:

Consider .

Sum and difference rule of integral : .

Power rule of integral formula : .

.

Solution :

.