17. Find the directional derivative =__⑰__ of f(x, y) = cos(x + y) at P(0, π) in the direction of 
.
阿摩線上測驗
登入
阿摩線上測驗
登入
17. Find the directional derivative =__⑰__ of f(x, y) = cos(x + y) at P(0, π) in the direction of .