Problem with triangles?

Taking the midpoint M of a segment AB = 2a construct the right triangle MBC of hypotenuse MB. Given the angle CMB = x let f (x) = AC ^ 2 + √ (3MC) * CB-5 / 2a ^ 2

Check that the function f (x) = (3a ^ 2cos ^ 2x-3a ^ 2sen ^ 2x + 2a ^ 2√3senxcosx) / 2

Determine for which position of C results f (x) <0 in the interval related to the problem

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