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OpenStudy (anonymous):

Find the equation of the tangent plane to the surface z=2cosxy=2 in (0,0)

OpenStudy (anonymous):

just to confirm, the surface is z = 2 cos xy, right?

OpenStudy (anonymous):

right

OpenStudy (anonymous):

So, find directional derivative at that point and it becomes the directional vector for the plane. Then pick a point and use it to find your constant.

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