Subject GRE-Style: Gradient and Directional Derivative

GRE Math Subject · Axiom Academy

EXAMPLE GRE-Style Gradient and Directional Derivative The unit vector in the direction of is: The directional derivative is: The directional derivative is , which is choice (C). As a sanity check, , confirming the result. GRE Insight: Always remember to normalize the direction vector! The directional derivative formula requires a unit vector.

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