Step 1:

(a) The expression is.

Factorize the denominator

is a linear factor repeated 3 times, Hence write three partial fractions.

is square factor, not repeated, so write partial fraction with a linear numerator.

.

Step 2:

(b) The expression is

Factorize the denominator.

Using partial fractions formula .

Solution:

(a) .

(b) .