## What is integration by parts?

Integration by parts is a mathematical technique for evaluating definite and indefinite integrals. It is based on the following formula:

``````∫ u(x)v′(x) dx = u(x)v(x) - ∫ u′(x)v(x) dx
``````

where u(x) and v(x) are any two functions of x.

To use integration by parts, we first need to choose two functions, u(x) and v(x). Then, we need to differentiate u(x) and integrate v(x). Finally, we substitute these values into the formula above and simplify the expression.

## How to use an integration by parts calculator

To use an integration by parts calculator, we simply need to enter the function that we want to integrate into the calculator. The calculator will then evaluate the integral and return the result.

Most integration by parts calculators allow us to choose the functions u(x) and v(x) ourselves. However, some calculators will automatically choose the functions for us.

## Tips for choosing an integration by parts calculator

When choosing an integration by parts calculator, there are a few things that we should keep in mind:

• The calculator should be able to evaluate a wide variety of integrals, including integrals with products of two functions, integrals with trigonometric functions, and integrals with exponential functions.
• The calculator should be easy to use and navigate.
• The calculator should be accurate and reliable.

## Examples of how to use an integration by parts calculator

Here are a few examples of how to use an integration by parts calculator:

Example 1: Evaluate the following integral:

``````∫ x ⋅ cos(x) dx
``````

Solution:

We can use integration by parts to evaluate this integral by choosing u(x) = x and v′(x) = cos(x). Then, u′(x) = 1 and v(x) = sin(x).

Substituting these values into the integration by parts formula, we get:

``````∫ x ⋅ cos(x) dx = x ⋅ sin(x) - ∫ 1 ⋅ sin(x) dx = x ⋅ sin(x) + cos(x) + C
``````

where C is an arbitrary constant of integration.

Example 2: Evaluate the following integral:

``````∫ e^x sin(x) dx
``````

Solution:

We can use integration by parts to evaluate this integral by choosing u(x) = e^x and v′(x) = sin(x). Then, u′(x) = e^x and v(x) = -cos(x).

Substituting these values into the integration by parts formula, we get:

``````∫ e^x sin(x) dx = e^x ⋅ -cos(x) - ∫ e^x ⋅ -cos(x) dx
``````

This gives us:

``````∫ e^x sin(x) dx = -e^x ⋅ cos(x) + e^x ⋅ sin(x) + C
``````

where C is an arbitrary constant of integration.

## FAQs about integration by parts calculators

### Q: What are the benefits of using an integration by parts calculator?

A: There are several benefits to using an integration by parts calculator:

• Integration by parts calculators can save us a lot of time and effort when evaluating integrals.
• Integration by parts calculators can help us to avoid errors when evaluating integrals.
• Integration by parts calculators can help us to understand the integration by parts technique better.

### Q: What are the limitations of integration by parts calculators?

A: Integration by parts calculators are not perfect. They can sometimes have difficulty evaluating integrals that are very complex or that involve special functions.

It is important to note that integration by parts calculators are not a substitute for learning the integration by parts technique. In order to use an integration by parts calculator effectively, we need to understand how the technique works.