pub fn one_over_pi<T>() -> Twhere T: RealNumber,
Returns 1 / pi.
1 / pi
four_over_pi()
half_pi()
one_over_two_pi()
pi()
quarter_pi()
root_half_pi()
root_pi()
root_two_pi()
three_over_two_pi()
two_over_pi()
two_over_root_pi()
two_pi()