2 2 1 - s + 2*s*c - c
1 - s^2 + 2*s*c - c^2
1*(c + 1 - s)*(c + -1 - s)
(1*(c + (1 - s)))*(c - (1 - s))
-(1 + s - c)*(-1 + s - c)
1.0 - c^2 - s^2 + 2.0*c*s