Integral of trig functions
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Partial integration, also known as partial integration by parts, is a method for evaluating definite and indefinite integrals by combining the product rule of differentiation with the technique of substitution. It is a powerful technique for solving integrals that cannot be evaluated using other methods and is particularly useful for solving integrals involving products of functions. The basic idea behind partial integration is to choose two functions, one to be differentiated and one to be integrated, and to make use of the product rule to simplify the integrand. This allows us to reduce the complexity of the integrand and make it easier to integrate.