Решите уравнение:
2-[tex] sin^{2} [/tex]x=[tex] cos^{2} [/tex]x+cos([tex] \frac \pi {2}{ } [/tex]-3x)
б) Укажите корни, принадлежащие промежутку 
[-[tex] \frac \pi {2}{} [/tex];[tex] \frac \pi {2}{} [/tex]).
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