Calculus 7E
The function is , point at and angle is .
Consider .
Apply partial derivative on each side with respect to x.
Substitute in the .
Apply partial derivative on each side with respect to y.
Substitute in the .
The directional derivative in the direction of a unit vector then
.
The directional derivative of the function at a point in the direction is
.
The directional derivative of the function is .
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