Which of the following is the partial derivative with respect to y of the function f(x,y) = 6xy + 5x + 7y − ln(9xy) • Ignore "Give your reasons" below. There is no need to give a reason. O f₂ = 6x + 7 - y f₁=6y +5 fy O None of the others 1 f₁ = 6y +5 - ƒ=6x+7 y 1 9xy 1 9xy -- - X 1 y

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