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I still didn't understand how to solve this problem....................
Let theta=xYoucan first convert cos^2, sin^2 and cos*sin terms to their double angle forms (eg cosx*sinx=sin2x/2). Then let 2x=yAfter that simply use either calculus to use Maxima minima or use the fact that |dcosx+esinx| is less than or equal to √(d^2+e^2).
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