View source for The Number that will not be changed by derivatives

====The Exponential Function====
#Exponential <math>e = 1+1+ {1 \over 2 !} + {1 \over 3 !} + {1 \over 4 !} + {1 \over 5 !} + {1 \over 6 !} + {1 \over 7 !} ....</math>
#Exponential Function <math>e^x = 1+x+ {x^2 \over 2 !} + {x^3 \over 3 !} + {x^4 \over 4 !} + {x^5 \over 5 !} + {x^6 \over 6 !} + {x^7 \over 7 !} ...</math>
#Exponential Function <math>(e^x)'=e^x</math>

so when every you meet Exponential just reminds yourself it will not be changed by the derivatives.
<noinclude>
====examples====

ex1:<math>f(x)=e^x + x^4</math>
answer1:<math>f'(x)=e^x + 4x^3</math>


ex2: <math>f(x)= {e^x \over x}</math>
answer2: <math>f'(x)= { (x-1)e^x \over x^2 }</math>
</noinclude>