设L是正向圆周x^2+y^2+2x=1,则∮[ln（x^2+y^2）dx+e^(y^2)dy]/(x^2+y^2+2x+

计算∫L(x^2-2y)dx+(x+y^2siny)dy,其中L是圆周x^2+y^2=2x的正向曲线, 计算I=∮1/x*arctan(y/x)dx+2/y*arctan(x/y)dy,L为圆周x^2+y^2=1,x^2+y 设L为取正向圆周的X^2+Y^2=1,求∫（-y）dx+xdy 设ln(x^2+y^2)=arctan(y/x),则dy/dx= ∫L(e^x siny-2y)dx+(e^x cosy-z)dy, L:上半圆周（x-a）^2+y^2=a^2 , y> dy/dx,y=(1+x+x^2)e^x 设L为取正向的圆周x²+y²=9,求曲线积分∮（2xy-2y）dx+(x²-4x)dy的值 ∫C (yx^3+e^y)dx+(xy^3+xe^y-2y)dy,其中C为正向圆周x^2+y^2=a^2 设L为逆时针方向的圆周x^2y^2=9则曲线积分∫L（e^(x-y)+xy）dx+(siny+e^(x-y))dy=? y=ln√1-2x,求dy/dx! 设y=y(x)是函数方程ln(x^2+y^2)=x+y-1所确定的隐函数,求dy/dx dy/dx-y/x=x^2