What is the angle between the unit vector $\vec { u }$ and $\nabla f ( a , b )$ if $f _ { a } ( a , b ) = - 0.5 \| \nabla f ( a , b ) \|$ ?
A) $5 \pi / 6$
B) $2 \pi / 3$
C) $\pi / 3$
D) $\pi / 6$

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The Answer of What is the angle between the unit vector $\vec { u }$ and $\nabla f ( a , b )$ if $f _ { a } ( a , b ) = - 0.5 \| \nabla f ( a , b ) \|$ ?
A) $5 \pi / 6$
B) $2 \pi / 3$
C) $\pi / 3$
D) $\pi / 6$

What Is the Angle Between the Unit Vector u⃗\vec { u }u

What Is the Angle Between the Unit Vector $\vec { u }$