where 
and 
[
The series within brackets is a G.P. and 
]
= 
= 
Evaluate the definite integrals as limit of sums$\int\limits_{\begin{smallmatrix} -1\\ \end{smallmatrix}}^{1}{{}}$ e^x dx
Evaluate the definite integrals as limit of sums$\int\limits_{\begin{smallmatrix} -1\\ \end{smallmatrix}}^{1}{{}}$ e^x dx