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View Full Version : Attn: PhD in Math/Mensa Members. Differentiate Please. Ty.



SoCalSpursFan
03-23-2007, 10:17 AM
Differentiate:

http://www.webassign.net/www22/symImages/d/6/b8fa320f4af2fc46f7e053bf236440.gif

In case its hard to see...

its The square root of ((x plus the square root of) x plus the square root of x.)

I can't figure it out.

The chain rule makes me want to die.

:reading :reading :reading

Phenomanul
03-23-2007, 10:44 AM
Differentiate:

http://www.webassign.net/www22/symImages/d/6/b8fa320f4af2fc46f7e053bf236440.gif

In case its hard to see...

its The square root of ((x plus the square root of) x plus the square root of x.)

I can't figure it out.

The chain rule makes me want to die.

:reading :reading :reading

http://i55.photobucket.com/albums/g138/hegamboa/calculusanswer.jpg

SoCalSpursFan
03-23-2007, 10:51 AM
http://i55.photobucket.com/albums/g138/hegamboa/calculusanswer.jpg

I take it you used an online function calculator?

I don't know if you are BSing me or not, but I'll try your answer.

Ty.

Sportcamper
03-23-2007, 10:53 AM
If I ever feel the need to know what that equation is about...I will ask Travis... :smokin

1369
03-23-2007, 10:53 AM
Is this one of those things like the solving of the Lie of 8 that really doesn't mean anything once it's solved?

Regardless, that made my brain itch just looking at it.

SoCalSpursFan
03-23-2007, 10:54 AM
Is this one of those things like the solving of the Lie of 8 that really doesn't mean anything once it's solved?

Regardless, that made my brain itch just looking at it.

Yea, not to mention I have to submit the answer online using things like,

"(1/2)(x+(x+x^(1/2))^(1/2))^(-1/2) (1+(1/2)(x+x^(1/2))^(-1/2))(1+(1/2)x^(-1/2))"

Thanks technology.

Phenomanul
03-23-2007, 11:04 AM
I take it you used an online function calculator?

I don't know if you are BSing me or not, but I'll try your answer.

Ty.

No, I did it by hand...... took an entire college ruled page to solve. For ease of viewing I then posted the answer in Microsoft Equation Editor format.

If I had my TI-89 I could doublecheck myself. It's at home.

SoCalSpursFan
03-23-2007, 11:16 AM
No, I did it by hand...... took an entire college ruled page to solve. For ease of viewing I then posted the answer in Microsoft Equation Editor format.

If I had my TI-89 I could doublecheck myself. It's at home.

hmmm...ill try it.

SoCalSpursFan
03-23-2007, 11:34 AM
http://i55.photobucket.com/albums/g138/hegamboa/calculusanswer.jpg

Well F. I put in (4sqrt(x)x(sqrt(sqrt(x)x(sqrt(x)+1)))+2sqrt(x)+1)/(8sqrt(x)x(sqrt(sqrt(x)x(sqrt(x)+1)))xsqrt(sqrt(sq rt(x)x(sqrt(x)+1)+x)))...which is what's in the box, and it still marked me wrong.

I have 2/5 submissions used.

Dumb question...but that is a radical right, not a divider and it's all one line?

baseline bum
03-23-2007, 11:38 AM
http://img260.imageshack.us/img260/2351/diffyp0.png

baseline bum
03-23-2007, 11:40 AM
No, I did it by hand...... took an entire college ruled page to solve. For ease of viewing I then posted the answer in Microsoft Equation Editor format.

If I had my TI-89 I could doublecheck myself. It's at home.

It's all about LaTeX, fuck MS

SoCalSpursFan
03-23-2007, 11:41 AM
http://img260.imageshack.us/img260/2351/diffyp0.png

It will take me a while to input that...ill try it though.

ty.

1369
03-23-2007, 12:41 PM
Tell 'em it can't be solved because there's an elephant in the way.

http://bp0.blogger.com/_g_XIhKBM59Y/Rehr9j-kFII/AAAAAAAAAPA/f6l6opshXxw/s400/ramp%5B1%5D.JPG

SoCalSpursFan
03-23-2007, 12:45 PM
I got the answer right on my 5th and final submission.

The answer was:

http://www.webassign.net/www16/symImages/6/2/5e39b43d93b35d30a9db5aed31271f.gif

aka:

(((1/((2sqrt(x))))+1)/((((2sqrt(x+sqrt(x))))))+1)/(2sqrt(sqrt(x+sqrt(x))+x))

Thanks for the help. Hope you enjoyed a little calc review.

TDMVPDPOY
03-23-2007, 01:00 PM
http://img410.imageshack.us/img410/3815/trianglemd8.jpg

Phenomanul
03-23-2007, 01:19 PM
http://img260.imageshack.us/img260/2351/diffyp0.png


Good catch... I accidentally dropped my factor of 2 on the 6th step....

ShoogarBear
03-23-2007, 01:26 PM
Good catch... I accidentally dropped my factor of 2 on the 6th step....Yeah, I was just about to point that out.

TDMVPDPOY
03-23-2007, 01:39 PM
http://img476.imageshack.us/img476/1563/view6phpzx8cd4.jpg

DarkReign
03-23-2007, 02:30 PM
I could care less about the real math....keep posting those maybe-fake answers.

baseline bum
03-23-2007, 02:43 PM
D'oh, mt bad. I pulled the d(x+sqrt(x))/dx factor outside the parentheses when I should have left it in without even noticing it as I was typing it in LaTeX. Whenever I tutor people in math I always tell them never to skip a single step, and I skipped the most important step of deriving it on a piece of paper before typesetting it. :lol


Here's the correct derivation in case anyone was confused by the one I put up above
http://img442.imageshack.us/img442/3589/diffes8.png

ShoogarBear
03-23-2007, 02:48 PM
Yeah, I was going to say something about that, too. Pretty sloppy work, guys.

baseline bum
03-23-2007, 02:53 PM
I should have just given the Serge Lang proof:

Solution is obvious QED

Nbadan
03-24-2007, 01:20 AM
Chain rule and nx^n-1 therom forum