9  Evaluation of Definite Integrals by Substitution
In the previous sections, we have discussed several methods for finding the indefinite
integral One of the important methods for finding the indefinite integral is the method
of substitution INTEGRALS         339
To evaluate 
( )
b
∫a f x dx
, by substitution, the steps could be as follows:
1 Consider the integral without limits and substitute, y = f (x) or x = g(y) to reduce
the given integral to a known form