1. The problem statement, all variables and given/known data I am in the process of solving second order differential equation by the variation of parameters method. I need to calculate ∫(et)*(tant)2 dt 2. Relevant equations (tanx)2 = (secx)2-1 ∫(secx)dx= lnlsecx*tanxl 3. The attempt at a solution I have used the trig identity to get this: ∫(et*((sect)2-1)dt = ∫et*(sect)2 dt -∫(et) dt =∫et*(sect)2 dt -et but am stuck here. Any help would be greatly appreciated. Thanks!