Cos^2x-7sinx+sinxcosx=7cosx

(cos(x)-7) (sin(x)+cos(x)) = 0 ______________________ 1/2 (-14 sin(x)+sin(2 x)+cos(2 x)+1) = 7cos(x) _________________________ 1/2 (-14 sin(x)+sqrt(2) sin(2 x+pi/4)+1) = 7 cos(x)     _______________________________________ x = 2 (pi n+tan^(-1)(1-sqrt(2))), n принадлежит Z ______________________________________ x = 2 (pi n+tan^(-1)(1+sqrt(2))), n принадлежит Z   ______________________________________ x = 2 pi n-cos^(-1)(7), n принадлежит Z ___________________________________________ x = 2 pi n+cos^(-1)(7), n принадлежит Z   ____________________________________