摘要
We know the Substitution Rule, which is based on the following identity in differentiation.∫f(g(x))g'(x)dx=∫(u)du(where u= g(x)) . Now, we'll talk about how to use the method of the improvising differentiation, and give some examples by using basic integration formulas, such as,∫(1/x)dx=1n|x|+C called the Log Rule for integration,∫e^x dx=e^x+C called the Exponential Rule.