多元函数的梯度 aF OF OFOF aF VF(o= ax, X Ox aF aF naF 2Dx cos 0, =VF(xo)d=VF(xo)cOs(VF, s) S多元函数的梯度 0 0 1 0 2 1 2 ( ) T n n F x F F F F F x x x x F x                     =                      x x x 0 0 0 0 1 cos ( ) ( ) cos( , ) n T i i i F F F F F s s x  =   = =  =     x x  x d x