f(x, y) = -(x - 3)² In²(y + 5)-(5x + 3y)². a) [ Find all the first partial derivatives of the function f(x, y). b) [] Determine the point(s) where the following function is defined g(x, y) 2 -(x - 3)² In² (y + 5)-25x² 30xy - 9y². -

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