2cos(x/4+3pi/8)+√3=0

2cos(x/4+3pi/8)+√3=0

deli vsyo na 2 I vmesto  √3/2 stav cos(PI/6

/2 cos(x/4+3PI/8)+√3/2=0 √3/2 eto cos(PI/6) cos(x/4+3PI/8)+cos(Pi/6)=0 prevrashayem v mnojitel coax+cosy=2cos(x+y)/2cos(x-y)/2 //cherez eto potom posmotri shto poluchayetsya