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Mathematics 9 Online
OpenStudy (anonymous):

x^2-6x+y^3 -12 y = 11. The derivative of the equation is y' = (6-2x)/(3y^2 - 12). Show that it is impossible for this curve to have a horizontal tangent along the line y =4.

OpenStudy (tkhunny):

You may wish to factor the denominator.

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