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OpenStudy (nicola):
f(x,y) = absolute value xy... Sketch?
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OpenStudy (anonymous):
z=(x,y). You already know that this graph, because it is a property of 2 dimensional space, will produce a blanket or a sheet of sorts. http://www.wolframalpha.com/input/?i=f(x,y)%20%3D%20abs(xy)
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