Question: Find all points where the given function has any local extrema. Give the values of any local extrema. Identify any saddle points. f(x,y) = 9xy

Find all points where the given function has any local extrema. Give the values of any local extrema. Identify any saddle points.

f(x,y) = 9xy - 4x2 - 9y2 + 1x + 9y + 4. Find the partial derivative fx.

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