Evaluate

=======================

Using trig substitution, let ,

Since , then

From here, I do not know how to proceed.

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- December 20th 2009, 08:24 AMPaperwings[SOLVED] Trig Substitution Integral
Evaluate

=======================

Using trig substitution, let ,

Since , then

From here, I do not know how to proceed.

- December 20th 2009, 08:30 AMred_dog

Let - December 20th 2009, 10:35 AMSoroban
Hello, Paperwings!

You have: .

- December 20th 2009, 08:56 PMPaperwings
Ah, yes. Thank you. So,

Let ,

Since

I am a little unsure how to simplify this.

I picture a triangle with sides x and 2. the hypothenuse is .

Ah, ok. it's