sin(pie-x)-sin(pie of two+x)= sinx-cosx。
Because the terminal edge of angle X passes through point p( 1, root number 3).
So sinx-cosx=[ root number (3)- 1]/2.
2
S∈{S|S=2k pie+pie /3,k∈z}
2cos2x+5sinx-4=-4sin^2x+5sinx-2
Then treat this formula as a system of binary linear equations.