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Exponential function math.exp and cmath.exp

suggest change

Both the math and cmath-module contain the Euler number: e and using it with the builtin pow()-function or **-operator works mostly like math.exp(): 

import math

math.e ** 2  # 7.3890560989306495
math.exp(2)  # 7.38905609893065

import cmath
cmath.e ** 2 # 7.3890560989306495
cmath.exp(2) # (7.38905609893065+0j)

However the result is different and using the exponential function directly is more reliable than builtin exponentiation with base math.e: 

print(math.e ** 10)       # 22026.465794806703
print(math.exp(10))       # 22026.465794806718
print(cmath.exp(10).real) # 22026.465794806718
#     difference starts here ---------------^
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Exponentation:
* Exponentiation
* Exponentiation using builtins and pow
* Square root math.sqrt and cmath.sqrt
* Modular exponentiation pow with 3 arguments
* Exponentiation using the math module math.pow
* Exponential function math.exp and cmath.exp
* Exponential function minus 1 math.expm1
* Magic methods and exponentiation builtin math and cmath
* Roots nth-root with fractional exponents
* Computing large integer roots
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