- #1

-EquinoX-

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- 1

## Homework Statement

Find the directional derivative of the function given below as you arrive at (0,1,3) from the direction of (1,1,0). Give an exact answer.

f(x,y,z) = sin(5 x) + ln(y^2+1) + z^3

## Homework Equations

## The Attempt at a Solution

I know how to solve this if it were a 2 dimension, I am just confused on what should I multiply the k direction with? The i is multiplied with cos, the j is with sin and what about the k?