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