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Explain integral multiple rule and partial fraction.

                  Partial fraction
Partial fractions is the opposite of adding fractions over a common denominator. It applies to integrals of the form

 Any rational function of a real variable can be written as the sum of a polynomial function and a finite number of algebraic fractions. Each fraction in the expansion has as its denominator a polynomial function of degree 1 or 2, or some positive integer power of such a polynomial.
             If the denominator is a 1st-degree polynomial or a power of such a polynomial, then the numerator is a constant. If the denominator is a 2nd-degree polynomial or a power of such a polynomial, then the numerator is a 1st-degree polynomial.


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