Try this problem from ISI-MSQMS 2015 which involves the concept of Integral Inequality.
INTEGRAL INEQUALITY | ISI 2015 | MSQMS | PART B | PROBLEM 7b
Show that $1<\int_{0}^{1} e^{x^{2}} d x<e$
Key Concepts
Real Analysis
Inequality
Numbers
Check The Answer
But Try the Problem First…
ISI – MSQMS – B, 2015, Problem 7b
“INEQUALITIES: AN APPROACH THROUGH PROBLEMS BY BJ VENKATACHALA”
Try with Hints
First hint
We have to show that ,
$1<\int_{0}^{1} e^{x^{2}} d x<e$
$ 0< x <1$
It implies, $0 < x^2 <1$
Now with this reduced form of the equation why don’t you give it a try yourself, I am sure you can do it.
Second hint
Thus, $ e^0 < e^{x^2} <e^1 $
i.e $1 < e^{x^2} <e $
So you are just one step away from solving your problem, go on………….
Final hint
Therefore, Integrating the inequality with limits $0$ to $1$ we get, $\int\limits_0^1 \mathrm dx < \int\limits_0^1 e^{x^2} \mathrm dx < \int\limits_0^1e \mathrm dx$
Other useful links
- https://www.cheenta.com/triple-integral-iit-jam-2016-question-15/
- https://www.youtube.com/watch?v=oUyHFKVB9IY