ЮС
Юлия Спиридонова
чуть-чуть тригонометрии
1-cos(x) = 2sin^2(x/2)
sin(x) = 2sin(x/2)*cos(x/2)
==>> 1-cos(x)+sin(x) = 2sin(x/2) * (sin(x/2)+cos(x/2))
sin(x/2)+cos(x/2) = sqrt(2)*sin(x/2+pi/4)
==>> 2sin(x/2) * (sin(x/2)+cos(x/2)) = 2*sqrt(2)*sin(x/2)*sin(x/2 +pi/4)