関連ワード:  antiderivative of 1/x^4    antiderivative of 1/(40-x)    antiderivative of 1 4 x 3    antiderivative of x 1 4sin 2x    antiderivative of 1/(x^2+4)    integral of 1 x 4    integration of 1 x 4 dx    integration of 1 x 4 8x 2 9    integration of 1 x 4 16    integral of 1 x 4 5