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#1 2012-09-06 03:01:46

Julieeeee
Guest

area

I'd like to check my result. I have to find area between

axis. I got

#2 2012-09-06 03:28:47

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,032

Re: area

Hi Julieeeee;

Is the purple shaded area what you want?

View Image: 2012-09-06_082550.gif

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#3 2012-09-06 03:36:49

Julieeeee
Guest

Re: area

Yes, I also got this picture

#4 2012-09-06 03:43:26

TheDude
Member
Registered: 2007-10-23
Posts: 361

Re: area

That's the answer I get Julie.


Wrap it in bacon

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#5 2012-09-06 03:44:35

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,032

Re: area

Hi Julieeeee;

Welcome to the forum.

This is what I did:

What did you do?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#6 2012-09-06 04:03:24

Julieeeee
Guest

Re: area

Thank you guys.
I did

#7 2012-09-06 04:16:11

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,032

Re: area

Hi Julieeeee;

That is correct and nice and simple.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#8 2012-09-06 08:01:47

Julieeeee
Guest

Re: area

What about tangent touching graph of

at a point

I get

And also...


But wolfram alpha says

Why is that so?

#9 2012-09-06 08:21:22

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,032

Re: area

Hi Julieeeee;

I am getting that for a tangent also. How did you get yours?

For that integral, Maple gets the first answer too. Might be that an absolute value is wrapped around each term and they have both left it out...

When I do it by hand I do not get Alpha's answer either.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#10 2012-09-06 09:06:12

Julieeeee
Guest

Re: area

by implicit differentiation I get



Hence

Thank you bobbym

#11 2012-09-06 09:08:22

Julieeeee
Guest

Re: area

bobbym wrote:

When I do it by hand I do not get Alpha's answer either.

Do you get my answer?

#12 2012-09-06 09:14:48

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,032

Re: area

Hi;

Have you seen an implicit plot of that equation?

Yes, I get your answer when I do the integration.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#13 2012-09-06 09:19:35

Julieeeee
Guest

Re: area

did you also do it like me?

#14 2012-09-06 09:21:56

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,032

Re: area

The tangent problem? No I used geogebra to get the tangents for me. But when I look at the graph I am not so sure of the answer we are all getting.

Question: Are you satisfied with your tangent line?

View Image: 2012-09-06_082550.gif

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

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