Тригонометрия. Решить уравнение.
[tex] cos^{2} 7x- sin^{2} 7x= -\frac{ \sqrt{3} }{2} [/tex]
[tex] cos^{2} 7x- sin^{2} 7x= -\frac{ \sqrt{3} }{2} [/tex]
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Cos14x=-√3/214x=+-5π/6+2πn
x=+-5π/84+πn/7