ne ponimaiu shto nujno zdelatiii..., vot ce mogu pomoci
cosα -sin (2α)*cos*(α)
_____ = cos(α)cot(α) = ___________________ ,
ctgα cos(2α) - 1
α = -Pi * n - pi / 2
(1-2у)(1-3у)=(6у-1)у-11-5y++y=-1-4y=-2y=