Directional derivative
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Find the directional derivative of f at P in the direction of v; that is find D_u f(P), where u=v/{v}:
f(x, y, z)= ln(1 + x^2 +y^2 - z^2) ; P(1, -1, 1), v=2i - 2j -3k
https://brainmass.com/math/derivatives/directional-derivative-functions-13784
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The directional derivative is:
D_u ...
Solution Summary
This shows how to find a directional derivative.
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