# definite integral

• Jan 12th 2019, 04:15 AM
arangu1508
definite integral
In one of our revision papers the following problem has been given:

integrate e^x/[1+x^2] within the limits 0 to 1.

using integration by parts I tried.

I am stuck.

How to solve. Kindly help me.

with warm regards

Aranga
• Jan 13th 2019, 09:18 AM
romsek
Re: definite integral
There is no closed form of familiar functions for this integral.
• Jan 13th 2019, 10:35 AM
Plato
Re: definite integral
Quote:

Originally Posted by arangu1508
In one of our revision papers the following problem has been given:
$\displaystyle\int_0^1 {\dfrac{{{e^x}}}{{1 + {x^2}}}dx}$

using integration by parts I tried. I am stuck. How to solve. Kindly help me.

To Aranga, as romsek has told you this integral has no elementary anti-derivative.
Using numerical methods it has a solution, SEE HERE.

However when I saw this was on a revision paper (a review paper for speakers of American English) I wondered if perhaps there had to be some mistake?
For what course are you reviewing?
• Jan 14th 2019, 12:26 AM
arangu1508
Re: definite integral
In India it is +2 means 12th grade or junior college level and it is a two mark question.

Probabily there may be some mistake in the question itself.

Revision paper means before going for the final (terminal) examination, there will be some tests conducted covering all the portions.

I saw the link sent by you. Definitely it is not to our (junior college) level.

Thanks

Aranga
• Jan 30th 2019, 03:41 PM
Prove It
Re: definite integral
I would be inclined to think that this question is meant to be solved using technology.
• Jan 31st 2019, 03:31 AM
HallsofIvy
Re: definite integral
Quote:

Originally Posted by Prove It
I would be inclined to think that this question is meant to be solved using technology.

I still wonder about the phrase "using technology". Paper and pencil don't grow on trees! They are every bit as "technological" as a calculator.
• Jan 31st 2019, 05:41 AM
Plato
Re: definite integral
Quote:

Originally Posted by HallsofIvy
Paper and pencil don't grow on trees! They are every bit as "technological" as a calculator.

The cellulose-graphite method.
• Jan 31st 2019, 01:50 PM
topsquark
Re: definite integral
Quote:

Originally Posted by HallsofIvy
Paper and pencil don't grow on trees!

But they can! We can get paper from the trunk and we can get the outer wood casing. And you can burn the tree to get the graphite! (Sun)

(I prefer pens anyway.)

-Dan