Posted by **shylo** on Saturday, October 24, 2009 at 4:48pm.

Hi there I am having some difficulties to solve this problem from my homework package and i don't understand how to approach this problem. Please help me by giving me advice on how to approach this problem.

Let z = xsin(x/y), y does not equal zero. Show that the tangent plane at any point of the surface passes through the origin.

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