# Integral of csc^2(x/2) | Summary and Q&A

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May 16, 2022
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The Math Sorcerer
Integral of csc^2(x/2)

## TL;DR

Learn how to integrate the cosecant squared of x over 2 by making a substitution and applying trigonometric identities.

## Key Insights

• ❓ Substituting trigonometric functions can simplify integrals and make them more manageable.
• 😑 Differentiating the substitution variable helps in simplifying the expression and getting rid of additional factors.
• ❓ Trigonometric identities, such as the derivative of cotangent, are useful in evaluating integrals involving trigonometric functions.
• 🫡 Constant factors can be pulled out of integrals, but variables being integrated with respect to should not be pulled out.

## Transcript

in this example we're going to try to integrate cosecant squared of x over 2 solution so if it was just cosecant squared we should we would be able to do it um just simply by thinking however it's the cosecant squared of x over 2. so we should make a substitution to make it look a little bit better so the natural choice is to let u be this inside p... Read More

### Q: What substitution should be made to integrate the cosecant squared of x over 2?

The substitution u = x/2 should be made to simplify the integral and make it easier to integrate.

### Q: How does differentiating u help in simplifying the expression?

Differentiating u gives du = (1/2)dx, which allows us to replace dx with 2du in the integral.

### Q: How can the integral of cosecant squared be evaluated?

The integral of cosecant squared can be evaluated using the identity that the derivative of cotangent is negative cosecant squared.

### Q: Why is it important to go back to the original variable of integration in the final answer?

It is important to go back to the original variable of integration (x in this case) to ensure the answer is expressed in terms of the original problem.

## Summary & Key Takeaways

• The content explains how to integrate the cosecant squared of x over 2 by making a substitution and simplifying the expression.

• By letting u equal x over 2, the substitution is made to transform the integral into a more manageable form.

• Differentiating u helps in simplifying the expression and removing the one-half factor.