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The process of integration and differentiation can considered as inverse of each other why because the Integration is the inverse process of differentiation. Instead of differentiating a function, we are given the derivative of a function and asked to find its primitive, i.e., the original function. Such a process is called integration or anti differentiation.
"Integration by Substitution" (also called "u-Substitution" or "The Reverse Chain Rule") is a method to find an integral, but only when it can be set up in a special way. When our integral is set up like that, we can do this substitution: Then we can integrate f(u), and finish by putting g(x) back as u.
NO, substitution gives accurate values and it is not at all waste of time.
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