求Z的全微分:Z=arcsin(xy) Z=xsin(x+y)
问题描述:
求Z的全微分:Z=arcsin(xy) Z=xsin(x+y)
答
Z=arcsin(xy)Z'xy=1/√(1-(xy)^2)(xy)'x=y(xy)'y=xdZ= Z'xy *(xy)'x dx+Z'xy*(xy)'y dy=ydx/√(1-(xy)^2 +xdy/√(1-(xy)^2Z=xsin(x+y)Z'x=sin(x+y)+xcos(x+y)Z'y=xcos(x+y)dZ=Z'x*dx +Z'y*dy=(sin(x+y)+xcos(x+y)) *...