Which of the following is true? * f (x, y) = x³ - 2xy + 3y² fx = 3x² - 2y + y³; fy = 6x Option 1 f = -2x+6y + 3xy²; fy = 3r²-2y+y³ Option 3 fax=6x; fay = −2 Option 2 fxx=6+6xy; fyy O Option 4

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