2 sin^2 x - (2 + radical(3)) cos x + 2 + radical(3) = 0
radicando 39+12sqrt(3) come 36+12sqrt(3)+3, ovvero un quadrato di binomio: (6+sqrt(3))^2
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2 sin^2 x - (2 + radical(3)) cos x + 2 + radical(3) = 0