
Here, you will learn to derive the Reduction formula for the integral of sin^n x with respect to x using product rule of integration.
You will learn to derive the reduction formula for the integral of sin^m x cos^n x. you may observed that the power m is remaining same but the power of n is reduced to n-2.
This is an alternative way or shortcut method to evaluate the integral of sin^m x cos^n x by using simple application of the derivatives. Moreover, the connection between the two integrals is easily established.
You have noticed somewhere that any formula which connects the given integral with another integral in which the integrand is of the same type but is of lower degree is called a Reduction Formula. Repeated or continuous application of reduction formula helps us to evaluate the given integral. This method of integration is called integration by successive reduction. Reduction formula can be easily derived using integration by parts i.e., product rule of integration. In this whole course, assume n, m are to be integers unless, otherwise stated.