Figure 1 below shows the curve y=e2xy=e^{2x}y=e2x for x>0x>0x>0.
The interval [2,5][2,5][2,5] is divided into n n\,n equal strips of width δx=3n\displaystyle \delta x=\frac3nδx=n3, and xi=2+iδxx_i=2+i\delta xxi=2+iδx.
Find the exact value of
limn→∞∑i=1ne2xi δx\displaystyle\lim_{n\to\infty}\sum_{i=1}^{n} e^{2x_i}\,\delta xn→∞limi=1∑ne2xiδx.