# I cannot prove that the integral is 0

## Homework Statement

Evaluate

http://img338.imageshack.us/img338/4931/52219436.png [Broken]

## Homework Equations

hint: the integral is zero.

## The Attempt at a Solution

I don't know how to tackle this, can someone give me a hint please? I looked at several subsitutions and IBP's but I'm stuck.

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## Answers and Replies

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Dick
Homework Helper

You can evaluate the integral in terms of the Euler Beta function. Use two different substitutions for each part and properties of the gamma function to show it's zero.

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You can evaluate the integral in terms of the Euler Beta function. Use two different substitutions for each part and properties of the gamma function to show it's zero.
The integral is in stewart's book problem plus section I very much doubt that the beta function needs to be invoked...

Dick
Homework Helper

The integral is in stewart's book problem plus section I very much doubt that the beta function needs to be invoked...
Then I would suggest you look at how the proof works in terms of the integral definition of the beta function and figure out how to do the same thing by manipulating the integrals without saying the words 'beta function'.

Cyosis
Homework Helper

In this special case it can be done without the beta function. Note that the two given functions are each others inverses on the interval [0,1].

Dick
Homework Helper

In this special case it can be done without the beta function. Note that the two given functions are each others inverses on the interval [0,1].
Nice observation!

In this special case it can be done without the beta function. Note that the two given functions are each others inverses on the interval [0,1].
This is what I've been waiting for.