Question about directional derivatives and tangent planes ?

Context: Undergrad
Thread starter basenne
Start date Jan 20, 2012
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Derivatives Planes Tangent

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basenne

Thread starter
Jan 20, 2012

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!

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mathwonk

Science Advisor

Homework Helper

Jan 21, 2012

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

Question about directional derivatives and tangent planes ?

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Question about directional derivatives and tangent planes ?

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