# Substitution help

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• Sep 17th 2008, 07:12 AM
Magua
Substitution help
∫(e^2θ) (sec^2)θ dθ

how would aproach this problem using substitution
• Sep 17th 2008, 07:51 AM
Chop Suey
You have to use integration by parts twice: $u = \sec^2{x}~~dv = e^{2x}$. You can treat the integral as the unknown and solve for it.