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Question about directional derivatives and tangent planes ?

  1. Jan 20, 2012 #1
    Is it possible to find a directional derivative for a point on z = f(x,y) at a point (x,y) in a direction (u1,u2) using the plane tangent to z at (x,y)?

    If so, how?

    Thanks!
     
  2. jcsd
  3. Jan 21, 2012 #2

    mathwonk

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    take the ray in that plane lying over the direction vector and take the directed slope.
     
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