證明曲線積分在整個xOy面內(nèi)與路徑無關(guān),并計(jì)算積分值: (2xy-y4+3)dx+(x2-4xy3)dy
證明曲線積分在整個xOy面內(nèi)與路徑無關(guān),并計(jì)算積分值: (6xy2-y3)dx+(6x2y-3xy2)dy