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OpenStudy (anonymous):
Are we unable to find the extrema of the function f(x,y) = y/(x^2+y^2) using the second partial test? http://imgur.com/ztIVY
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OpenStudy (anonymous):
a and b must be (0,0) or at least one of them has to be 0 to be critical points of the function
OpenStudy (anonymous):
if the point is (0,0) fxx or fyy will be undefined
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