Question: 2 1 - 3 0 . Computing directional derivatives with the gradient Compute the directional derivative of the following firmetions at the gloen point P

21 - 30 .

Computing directional derivatives with the gradient Compute the directional derivative of the following firmetions at the gloen point P in the direction of the given vector. Be sure to use a unit vector for the direction vector.

21 . f (x, y) = x^{2} - y^{2}

;

P (- 1, - 3)

;

(

\frac{3}{5}, - \frac{4}{5}

)

2 1 - 3 0 . Computing directional derivatives

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