>>> from funcmat import k

>>> print(round(k(0.0), 4))
50.6458
>>> print(round(k(2.0), 4))
3.7612
>>> print(round(k(-20.0), 4))
-8671176.6291
>>> print(round(k(9.876), 4))
-106005.465
>>> print(round(k(0.00836345), 4))
50.6442
>>> print(round(k(-1.01111), 4))
31.108