上课没听讲,目前在自学.求教fxdx/4+xfx^2+1/x^4+1dxfcos^5xsinxdx注意sinx有根号,
对不起,没写清楚fxdx/(4+x^4)
fx^2+1/(x^4+1dx
fcos^5xsinxdx注意sinx有根号,