Срочно!!!!! sin 2x-22cos^2 x+10=0

7sin2x-22cos^2x+10=014sinxcosx - 22cos^2x + 10(sin^2x + cos^2x) = 014sinxcosx -12cos^2x +10sin^2x = 0  |:cos^2x14tgx - 12 + 10tg^2x = 05tg^2x +7tgx - 6 = 0tgx = t5t^2 +7t - 6 = 0D = 49 + 4*5*6 = 169t = (-7 +- 13)/10t = -2   t = 3/5tgx = -2                            tgx = 3/5x = -arctg2 + Пk                x = arctg(3/5) + Пk