関連ワード:  integration of x 3 e 2x    integration of x 3 e 2x dx    integral of x 3e 2x 2    integral x 3e 2x dx    integrate x 3e 2xdx    evaluate integrate x 3 * e 2x dx    integration of 2x 3 e x 2    integration of 2x 3 e x 2 dx    integration of 1 1 3e x 2e 2x    integration of 3e^2x