Найти область значений функции

y = cos(x)/((cos(x/2)-sin(x/2))

y=(cos²(x/2)-sin²(x/2))/(cos(x/2)-sin(x/2))==(cos(x/2)+sin(x/2))(cos(x/2)-sin(x/2))/(cos(x/2)-sin(x/2)==cos(x/2)+sin(x/2)=sin(π/2-(x/2))+sin(x/2)==2sinπ/4cos(π/4-(x/2))=2*√2/2cos(π/4-(x/2))=√2cos(π/4-(x/2)E(y)∈√2*[-1;1]=[-√2;√2]Ответ [-√2;√2]