若f(x,y)=y+sin(x+y),则f✀y(0,0)=

2025-06-28 22:56:53
推荐回答(1个)
回答1:

f(x,y) = y+sin(x+y),
f' = 1+cos(x+y)
f'(0,0) = 1+cos0 = 2