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Mathematics 9 Online
OpenStudy (anonymous):

Find the stationary points and local extreme values of f(x,y)=(x-6)ln(xy)?

OpenStudy (anonymous):

Use the second partial test for function of two variables. calculate the discriminant D(x,y) = f_(xx) (x,y) f_(yy)(x,y) - f^2_(xy)(x,y)

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