Question: Use Exercise 8.4.45 to find the minimum and maximum of the following rational functions: (a) 3x2 + 2y2 / 4x2 + 5y2 (b) x2 -

Use Exercise 8.4.45 to find the minimum and maximum of the following rational functions:
(a) 3x2 + 2y2 / 4x2 + 5y2
(b) x2 - x y + 2y2 / 2x2 - xy + y2
(c) 2x2 + 3y2 + z2 / x2 + 3y2 + 2z2
(d) 2x2 + 6xy + 11y2 + 6yz + 2z / x2 + 2xy + 3y2 + 2yz + z2

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