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Re: Simple math help please

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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:19 PM
I can't seem to derive sinh from Euler's formula, I can some reason get cosh though.

e^ix + e^-ix = cosx + isinx + cosx - isinx

cosh:
2cosx = e^ix + e^-ix
cosx = (e^ix + e^-ix)/2
coshx = (e^x + e^-x)/2

sinh:
...


I some reason can't think of a way to get sinh
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:21 PM
I know sinh is: (e^x - e^-x)/2
But I want to be able to "get it"
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AngryTheGostigust is not online. AngryTheGostigust
Joined: 24 Oct 2013
Total Posts: 15398
03 Nov 2013 01:21 PM
google
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blendernator55 is not online. blendernator55
Joined: 09 Feb 2008
Total Posts: 5785
03 Nov 2013 01:21 PM
The answer is "Fish."

fgsd
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:22 PM
I couldn't find the actual way over google, only the answer which I alreayd knew...
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TheAngryTerrorist is not online. TheAngryTerrorist
Joined: 22 May 2013
Total Posts: 2281
03 Nov 2013 01:22 PM
Uhh...


Ummm...


3?
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:23 PM
^ If only
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speedydude123 is not online. speedydude123
Joined: 14 May 2010
Total Posts: 1388
03 Nov 2013 01:23 PM
OT is dumb, I just started algebra :P
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ElectrikFish is not online. ElectrikFish
Joined: 04 Feb 2013
Total Posts: 6518
03 Nov 2013 01:23 PM
4

furga000's alt | banned for 2 days
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:23 PM
I'm pretty sure someone can help, I don't want to go into another forum where it is probably considered spam.
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NotInOurStars is not online. NotInOurStars
Joined: 07 Mar 2012
Total Posts: 20883
03 Nov 2013 01:26 PM
if the math is "simple" then why do you need help?
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:27 PM
Because I feel like I'm not seeing a simple step, if cosh was that easy, why isn't sinh...
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speedydude123 is not online. speedydude123
Joined: 14 May 2010
Total Posts: 1388
03 Nov 2013 01:27 PM
No one can help ok? Ask a family member instead nine year olds ._.
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kitty234 is not online. kitty234
Joined: 03 Feb 2009
Total Posts: 9369
03 Nov 2013 01:27 PM
42

Memento Mori
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:28 PM
Just kidding, I got it.
It was simple..
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:31 PM
if
e^ix = cosx + isinx
and
e^-ix = cosx - isinx
then
-(e^-ix) = -cosx + isinx
therefor
e^ix - e^-ix = cosx + isinx - cosx + isinx
leads to
e^ix - e^-ix = 2isinx
which finally gives
sinh = (e^x - e^-x)/2
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BlastHardCheese is not online. BlastHardCheese
Joined: 07 May 2013
Total Posts: 8979
03 Nov 2013 01:31 PM
sinh = e^x - e^-x

noob
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BlastHardCheese is not online. BlastHardCheese
Joined: 07 May 2013
Total Posts: 8979
03 Nov 2013 01:32 PM
e^x - e^x / 2 ***
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BlastHardCheese is not online. BlastHardCheese
Joined: 07 May 2013
Total Posts: 8979
03 Nov 2013 01:32 PM
oops, i posted late

damn floodcheck
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
03 Nov 2013 01:33 PM
I already knew that, I just wanted the "proof."

If you know how to read you would of seen that I had known that
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BlastHardCheese is not online. BlastHardCheese
Joined: 07 May 2013
Total Posts: 8979
03 Nov 2013 01:33 PM
"If you know how to read you would of seen that I had known that"

*would have seen

Oh, the irony.
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