p=pi(100)
r2d(p)
r2d(2 * p)
r2d(p / 2)
r2d(p / 4)
r2d(p / 3)
r2d(p / 5)
r2d(p / 6)
r2d(p / 10)
r2d(-p)
r2d(2 * -p)
r2d(-p / 2)
r2d(-p / 4)
r2d(-p / 3)
r2d(-p / 5)
r2d(-p / 6)
r2d(-p / 10)
