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```
The product rule, says that the derivative of a product is the sum gotten by differentiating each factor as if the other were constant and adding up the results. We can read this backwards as a way to handle an integrand of the form fg, when we know how to handle the integrand f g. For, we can write the product rule as fg = (fg) - f g and integrating both sides tells us This statement is called "integrating by parts" and is useful for integrands like xkexp(x) or ln(x) or xln(x). For example, to integrate ln(x), set f(x) = ln(x) and g(x)= 1. Then and g(x) = x. We can conclude that the integral of ln(x) from a to b is bln(b) - aln(a) - (b - a).

```
6 years ago

Nishant Vora
IIT Patna
2467 Points
```							Dear student,The product rule is stated is for derivativesAnd in integration we have a rule called integration by partsboth are different , you are mixing up thingsCheck definitions again !
```
4 years ago
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### Course Features

• 731 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions