Antiderivative Calculus cos(2x) cos(2x) e^x sinx indefinite integral integral integral of cos(2x) integral of e^x sinx integral of lnx integral of lnx/x integral of lnx/x^2 integral of sin(lnx) integral of tanx Integration Integration By Parts lnx lnx/x lnx/x^2 problems sin(lnx) tanx u-substitution