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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

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This shows how to find a directional derivative.

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The directional derivative is:
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