J jeca86 Junior Member Joined Sep 9, 2005 Messages 62 Feb 2, 2006 #1 evaluate the integral. the integral of e^-theta * cos2theta * dtheta i have: u=cos2theta, du=-2sin2*dtheta dv-e^-theta v=-e^-theta =-e^-theta * cos2theta - integral of e^-theta * 2sin2*dtheta is this right? this is where i get stuck.
evaluate the integral. the integral of e^-theta * cos2theta * dtheta i have: u=cos2theta, du=-2sin2*dtheta dv-e^-theta v=-e^-theta =-e^-theta * cos2theta - integral of e^-theta * 2sin2*dtheta is this right? this is where i get stuck.
U Unco Senior Member Joined Jul 21, 2005 Messages 1,134 Feb 2, 2006 #2 Nice work. Now if you do parts on \(\displaystyle \mbox{-2\int e^{-\theta}\sin{(2\theta)} d\theta}\) what do you notice?
Nice work. Now if you do parts on \(\displaystyle \mbox{-2\int e^{-\theta}\sin{(2\theta)} d\theta}\) what do you notice?
