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Forums - General - Who's up for some math problems?

twesterm on 26 December 2008
lestatdark said:

Can you find me the first derivative of the Arctan(x2 + x) equation?

 

f(x) = arctan(x2+x)

f'(x) = 1 / ((x2+x)2 + 1) = 1 / (x2(x+1)2)

 

 



 

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The_vagabond7 on 26 December 2008

.....42....*walks away in shame*



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lestatdark on 26 December 2008
twesterm said:
lestatdark said:
 

Can you find me the first derivative of the Arctan(x2 + x) equation?

 

f(x) = arctan(x2+x)

f'(x) = 1 / ((x2+x)2 + 1) = 1 / (x2(x+1)2)

 

 

 

 Well done Twesterm, but the final result is 1/(x2(x+1)2+1), you forgot the 1 ;)



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twesterm on 26 December 2008
lestatdark said:
twesterm said:
lestatdark said:

Can you find me the first derivative of the Arctan(x2 + x) equation?

 

f(x) = arctan(x2+x)

f'(x) = 1 / ((x2+x)2 + 1) = 1 / (x2(x+1)2)

 

 

 

 Well done Twesterm, but the final result is 1/(x2(x+1)2+1), you forgot the 1 ;)

bah, forgot to copy it from paper to here :-p

 



 

lestatdark on 26 December 2008

no problem ;) you really have good math skills, do you have a degree (i don't know if that's spelled correctly, because here in portugal it's a licenciatura, kinda like when you finish university)?



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ssj12 on 26 December 2008
fuegonian said:
3 [ 4 - 3 ( 6 - 7 ) ] =

using basic order of operations

3 [4 - 3(-1)]

3[4-(-3)]

3*7

21

 



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Lingyis on 26 December 2008
twesterm said:
lestatdark said:
twesterm said:
lestatdark said:

Can you find me the first derivative of the Arctan(x2 + x) equation?

 

f(x) = arctan(x2+x)

f'(x) = 1 / ((x2+x)2 + 1) = 1 / (x2(x+1)2)

 

 

 

 Well done Twesterm, but the final result is 1/(x2(x+1)2+1), you forgot the 1 ;)

bah, forgot to copy it from paper to here :-p

 

 

do i even need to correct this?  it's clearly wrong.



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Lingyis on 26 December 2008
vlad321 said:

So I have only seen Calculation done in this thread, not actual math. Here's a nice eas warm up question:

Let U be a subspace of a finite-dimensional vector space V. Show that if dim(U) = dim(V) then U = V.

 

this is not math.  this is just knowing the definition and the result follows immediately.  this question brings new meaning to the mathematician's meaning of "trivial".    (which, by and large, for mathematicians, means "the result has been proven". so a running joke is that for mathematicans there's only 2 types of problems: trivial ones and non-trivial ones.)



the Wii is an epidemic.

twesterm on 26 December 2008
Lingyis said:
twesterm said:
lestatdark said:
twesterm said:
lestatdark said:

Can you find me the first derivative of the Arctan(x2 + x) equation?

 

f(x) = arctan(x2+x)

f'(x) = 1 / ((x2+x)2 + 1) = 1 / (x2(x+1)2)

 

 

 

 Well done Twesterm, but the final result is 1/(x2(x+1)2+1), you forgot the 1 ;)

bah, forgot to copy it from paper to here :-p

 

 

do i even need to correct this?  it's clearly wrong.

My answers wrong?  >_>

-edit-

And to answer lestatdark, I should have a minor in math, I just didn't get around to declaring it.  >_<

 



 

Lingyis on 27 December 2008
twesterm said:
Lingyis said:
twesterm said:
lestatdark said:
twesterm said:
lestatdark said:

Can you find me the first derivative of the Arctan(x2 + x) equation?

 

f(x) = arctan(x2+x)

f'(x) = 1 / ((x2+x)2 + 1) = 1 / (x2(x+1)2)

 

 

 

 Well done Twesterm, but the final result is 1/(x2(x+1)2+1), you forgot the 1 ;)

bah, forgot to copy it from paper to here :-p

 

 

do i even need to correct this?  it's clearly wrong.

My answers wrong?  >_>

-edit-

And to answer lestatdark, I should have a minor in math, I just didn't get around to declaring it.  >_<

 

yeah, it's wrong.  i hope you're not doing anything related to math these days... because if an engineer or scientist get this kind of derivative wrong there's no excuse.  but your profile says you're a designer so i guess it's okay (just that maybe there's a reason you weren't a math minor!).

 



the Wii is an epidemic.