Question 2 Given the function of two variables f(x, y) = (x - 9)² In² (y + 8)-(8x +9y)². Find all the first partial derivatives of the function f(x, y). Determine the point(s) where the following function is a) b) defined g(x, y) = −(x − 9)² In²(y + 8)−64x² − 144xy – 81y². -

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