# Translations:The directional derivative/6/en

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In general, we want to know the slope in some arbitrary direction. Recall that a unit vector is a vector with length, or magnitude, of one. We can convert any vector into a unit vector in the same direction by dividing the vector by its magnitude. Hence, the unit vector for direction angle (as measured from the horizontal) can be represented by . If we let represent distance in the direction of the vector **w**, then