Sinx+(cosx/2-sinx/2)(cosx/2+sinx/2)=0
Sinx+(cos²x/2-sin²x/2)=0 sinx+cosx=0 sinx+sin(π/2-x)=0 2sinπ/4cos(x-π/4)=0 cos(x-π/4)=0 x-π/4=π/2+πn x=π/4+π/2+πn x=3π/4+πn