Решите тригонометрическое неравенство
[tex] \cos {}^{2} ( {x} ) - \sin {}^{2} (x) \leqslant \frac{ \sqrt{3} }{2} [/tex]
[tex] \cos {}^{2} ( {x} ) - \sin {}^{2} (x) \leqslant \frac{ \sqrt{3} }{2} [/tex]
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