Уравнение по тригонометрии
[tex]sin^2x-2cos^2x=sin2x[/tex]
После преобразований получаю:
[tex]tg^2x-2tgx-2=0\\tgx=u\\u^2-2u-2=0\\D:4+8=12[/tex]
Всё верно?
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