Решение. 3*sin(2*x)-4*sin(x)*cos(x)+5*cos(2*x)=0;6*sin(x)*cos(x)-4*sin(x)*cos(x)+5*(cos(x))^2-5*(sin(x))^2)=0; 2*sin(x)*cos(x)+5*(cos(x))^2-5*(sin(x))^2)=0; 5*(tg(x))^2-2*tg(x)-5=0; tg(x1)=(1+26^0,5)*0,2; tg(x2)=(1-26^0,5)*0,2;