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9-20 Locate all relative maxima, relative minima, and saddle points, if any. 9. f (x, y ) = y + xy + 3y+2x+3 10. f(x,

9-20 Locate all relative maxima, relative minima, and saddle points, if any. 9. f (x, y ) = y + xy + 3y+2x+3 10. f(x, y) = x2 + xy - 2y - 2x+1 11. f(x, y) = x2 + xy+ yz - 3x

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