>>> from maclaurin1 import serie1, serie2
>>> import math

>>> def f1 (x):
...    return 1/(1-x)

>>> round(f1(0.2), 4)
1.25
>>> round(f1(-0.8), 4)
0.5556
>>> round(f1(-0.4), 4)
0.7143

>>> round(serie1(0.2, 0.01), 4)
1.24
>>> round(serie1(-0.8, 0.01), 4)
0.5607
>>> round(serie1(-0.8, 0.0001), 4)
0.5555
>>> round(serie1(-0.4, 0.0001), 4)
0.7143

>>> round(math.atan(0.2), 4)
0.1974
>>> round(math.atan(-0.8), 4)
-0.6747
>>> round(math.atan(-0.4), 4)
-0.3805

>>> round(serie2(0.2, 0.01), 4)
0.2
>>> round(serie2(0.2, 0.0001), 4)
0.1973
>>> round(serie2(-0.8, 0.0001), 4)
-0.6748
>>> round(serie2(-0.4, 0.0001), 4)
-0.3805