# Area of a curve revolved about x-axis

1. Mar 2, 2009

### nweis84

I'm pretty sure i'm setting this up right i just get stuck when i need to integrate it

the equation is y=e^x and rotated around the x axis

I've attached the question

can someone help me thanks

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2. Mar 2, 2009

### Tom Mattson

Staff Emeritus
You'll need 2 substitutions. The most obvious first substitution would be to let $u=e^x$. Follow that up with an appropriate trig substitution and you're home free.