u=x^y x=f(t),y=g(t) 求du/dt

u=x^y x=f(t),y=g(t) 求du/dt
u=x^y x=f(t),y=g(t) 求du/dt

u=x^y x=f(t),y=g(t) 求du/dt
打不出偏导符号用求导代替了
du/dt =du/dx*dx/dt+du/dy*dy/dt
=x^y*(y/x)*f'(t)+lnx*(x^y)*g'(t)