КК Кристина Казанова Ответ. tg(x-15)*ctg(x+15)=1/3; (sin(x-15)*cos(x+15))/(sin(x+15)*cos(x-15))=1/3; (sin(2*x)-sin(30))/(sin(2*x)+sin(30))=1/3; 3*(sin(2*x)-0,5)=sin(2*x)+0,5; 2*sin(2*x)=2; sin(2*x)=1;