What are the minimum and maximum values of the following rational functions: (a) 3x2 - 2y2 /
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(a) 3x2 - 2y2 / x2 + y2
(b) x2 - 3xy + y2 / x2 + y2
(c) 3x2 + xy + 5y2 / x2 + y2
(d) 2x2 + xy + 3xz + 2y2 + 2z2 / x2 + y2 + z2
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