# Finding Directional Derivatives

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Consider the function f(x,y,z)= e^xy cos(x+z). What is the directional derivative for f at the point P(0, -pie/6, pie/3) in the direction u parallel to i - j + 2k

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Consider the function f(x, y, z) = exycos(x + z). What is the directional derivative for f at the point

P(0, - /6, /3) in the direction u parallel to i - j + 2k?

grad f =

=

Unit vector

The directional derivative for f at the point in the direction of u =

At x = 0, y = -/6, z =

Directional derivative =

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