# integration by parts, DI method, VERY EASY | Summary and Q&A

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February 20, 2016
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integration by parts, DI method, VERY EASY

## TL;DR

Learn the step-by-step process of integration by parts using the DI method for different functions.

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### Q: What is the DI method used for in integration by parts?

The DI method is used to break down the original integral into two parts: one to differentiate and one to integrate, making the integration process easier.

### Q: How do we determine which part to integrate and differentiate in the DI method?

Generally, we choose the part that we can easily integrate to be differentiated and the part that is harder to integrate to be integrated.

### Q: What are the key steps in the DI method?

The key steps in the DI method include differentiating one part of the function, integrating the other part, constructing the answer using the product of the diagonals, and stopping when the function part repeats.

### Q: Can the DI method be applied to all types of integrals?

Yes, the DI method can be applied to various types of integrals, including those involving trigonometric functions, logarithmic functions, and exponential functions.

## Summary & Key Takeaways

• The DI method involves breaking down the original integral into two parts: one to differentiate and one to integrate.

• The product of the diagonals along with the sign on the side gives the first part of the answer.

• When a row in the table repeats the function part, the integration stops, and the answer can be constructed.