# Area of a curve revolved about x-axis

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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• Ihatecalculus.doc
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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.