x^2+y^2+z^2=1即空间曲面为球面 F(x,y,z)= x^2+y^2+z^2-1=0F分别对x,y,z偏导,分别为 2x,2y,2z∴曲面在(x0 ,y0 ,z0)（ 即a=a0 b=b0时）处得切平面为2x0(x-x0)+2y0(y-y0)+2z0(z-z0)=0∴x x0+ y y0+z z0=1即 x sin(a0)c...