(cosx+sinx)/(cosx-sinx)=ctgx (cosx+sinx)/(cosx-sinx)=cosx/sinx cosxsinx+sin^2x-cos^2x+sinxcosx=0 sin2x-cos2x=0 sin2x=cos2x tg2x=1 x=П/8+Пk/2 ответ х=П/8+Пk/2 2sin^2x+√3*sin2x=1+2cosx 2sin^2x-sin^2x-cos^2x+√3*sin2x=2cosx √3*sin2x-cos2x=2cosx cosx+cos(П/3+2x)=0 cos(3x/2+П/6)=0 cos(П/6+x/2)=0 3x/2+П/6=П/2+Пk x/2+П/6=П/2+Пk x=2П/9+2Пk/3 x=2П/3+2Пk