(偏导数的符号用a代替了)
两边对x求偏导数:
Fx+Fz*az/ax=0
az/ax=-Fx/Fz
两边对x求偏导数:
a^2z/ax^2=-(FxxFz+FxzFz*az/ax-Fx(Fzx+Fzz*az/ax))/Fz^2
=-(FxxFz-FxzFz*Fx/Fz-FxFzx+FxFzz*Fx/Fz)/Fz^2
=-(FxxFz^2-2FxzFxFz+FzzFx+FzzFx^2)/Fz^3 (因为Fxz=Fzx)
(偏导数的符号用a代替了)
两边对x求偏导数:
Fx+Fz*az/ax=0
az/ax=-Fx/Fz
两边对x求偏导数:
a^2z/ax^2=-(FxxFz+FxzFz*az/ax-Fx(Fzx+Fzz*az/ax))/Fz^2
=-(FxxFz-FxzFz*Fx/Fz-FxFzx+FxFzz*Fx/Fz)/Fz^2
=-(FxxFz^2-2FxzFxFz+FzzFx+FzzFx^2)/Fz^3 (因为Fxz=Fzx)