sinx/2 + cosx/4 + sinx = 0
sin(x/2)+cos(x/4)+sinx=0;
2sin(3x/4)*cos(x/4)+cos(x/4)=0;
cos(x/4)*(2sin(3x/4)+1)=0;
cos(x/4)=0;
x/4=π/2+πn. n∈Z.
x=2π+4πn. n∈Z.
2sin(3x/4)+1=0;
sin(3x/4)=-1/2;
3x/4=(-1)^(n+1) * (π/6)+πk. k∈Z.
x=(-1)^(n+1) * (2π/9)+πk. k∈Z.
Легкое уравнение...