Find the maximum and minimum value of th...

Find the maximum and minimum value of the sum of the squares of the roots of the equatiorn `x^2 + (3 sin phi-4 )x +1/2cos^2 phi = 0`. For what value of `phi` in `(-pi,pi)` these extreme values occur.

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Find the maximum and minimum value of the sum of the squares of the roots of the equatiorn `x^2 + (3 sin phi-4 )x +1/2cos^2 phi = 0`. For what value of `phi` in `(-pi,pi)` these extreme values occur.

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