p1 =(1.2246467991473532E-16, -1.0)[3.141592653589793 : 1.0]
p2 =(1.2246467991473532E-16, -1.0)[3.141592653589793 : 1.0]
p1 =(1.0, 6.123233995736766E-17)[1.5707963267948966 : 1.0]
p2 =(1.2246467991473532E-16, -1.0)[3.141592653589793 : 1.0]
