Improper fraction can be expressed in proper fraction without doing long division.

# Category: Partial fraction

## Partial fraction: Cover-up rule

Partial fraction is commonly used in binomial expansion, method of difference and integration.

When the divisor consists only of linear factors, cover up rule can be used to find the constants in the partial fraction quickly.

**Example**

By cover up rule,

Therefore

0 = A+C

Therefore,