Suppose f is a differentiable function of x and y, and g(r, s) = f(2r - s, s² - 7r). Use the table of values below to calculate gr(7, 6) and gs(7, 6). gr(7,6) 9s(7,6) = = f g fx fy (8, -13) (7, 6) 2 5 3 8 5 2 4 7

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