Calculus Recitation Class 4/25

ch14.1 p941 45, 46, 53 ch14.2 p950 5, 9 p951 29, 35 另有兩題Additional Exercises ( ch14.6) 1. Find unit vector(s) U=<u, v> such that the directional derivative of f(x,y) =x^2+exp(-xy) at the point (1,0) in the direction of U has the value 1. 2. Find the directions in which the directional derivative of f(x,y)=y*exp(-xy) at the point (0,2) has the value 1. ch14.3 p964 15, 21, 29, 41 參考解答及助教課內容： https://drive.google.com/drive/folders/0BzLFFmXBAaNoMmNLOURlREttSUk?usp=sharing