x^5/(1-x^2)^(1/2)dx1-x^2>0 xE(-1,1)设x=cosx xE(0,pai) dx=-sinxdx (1-x^2)^(1/2)=sinx 原式=cos^5x/sinx*(-sinx)dx =-cos^5xdx =-cos^4xdsinx =-(1-sin^2x)^2dsinx =(2sin^2x-1-sin^4x...
