z
= 1 +
x
² +
y
²
u
= ⟨cos
φ
, sin
φ
⟩ at
P
0
(1, 1)
D
u
f = 2.83
fastest increase
D
u
f
=
2.83
of
‖∇
f
‖
=
2.83
Snap to:
u
∥ ∇
f
u
∥ −∇
f
D
u
f
= 0
▶ Play
Spin
φ =
45
°