2sin2x+cosx+4sinx+1=0
4sinxcosx+cosx+4sinx+1=0
4sinx(cosx+1)+cosx+1=0
(cosx+1)(4sinx+1)=0
cosx=-1 sinx=-1/4
x=pi+2pik . k=z x=(-1)^(n+1) *arcsin(1/4) +pik . k=z