4. Find the extreme values of the function f(x, y, z) = xy + z^2 on the circle of intersection of the plane y-x = 0 and the sphere x^2+y^2+ z^2=4. What is difference between the absolute maximum and minimum values? Select one: а. 2 b. 4 с. 1 d. 5/2 C e. 9/2

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A: To Prove:  ann is bounded sequence if and only if limsupan&lt;+∞.

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