Cambridge Chat (previously New Cambridge Students Entry 2004)

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Camford
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#11321
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#11321
Int by parts. That trick works well on these *****es.
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Willa
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#11322
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#11322
yes i do but i get a 0.5 which the answers says isnt ther!
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Camford
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#11323
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#11323
http://scholar.google.com/scholar?hl...=off&q=cosh-1x

3 results on cosh-1x
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Willa
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#11324
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#11324
those fail to help
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Camford
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#11325
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#11325
I know that. But it's google Scholar Beta....
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Katie J
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#11326
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#11326
I'm having a food crisis! I'm hungry and don't have anything other than pasta which I have eaten for the past few days (rowing :rolleyes: ) and supernoodles, rice, tuna, tomato sauce and other useless stuff like herbs and salt. I've run out of porridge and only have some green bananas! I really should have gone shopping today instead of writing my essays!
Where can I get food this time of night on a Sunday??
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Camford
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#11327
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#11327
May I suggest Gardie's to you?
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fishpaste
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#11328
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#11328
(Original post by Willa)
ok so lets try again, see if the answer suddenly comes to me...someone answer it non the less

integrate cosh-1 x........i get a 0.5 appearing, someone help!
if it's not in the answer it's probably been absorbed into the constant. but i'm not 100% as to where you're saying it's appearing
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Katie J
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#11329
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#11329
(Original post by Camford)
May I suggest Gardie's to you?
Ergh, I can't stomach that now! I would go out for a meal but too much work to do, might have to cycle down to the co-op, I'm very hungry!!
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Camford
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#11330
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#11330
I have enough chocolate to feed a small nation in my room. Fancy some?
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crana9
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#11331
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#11331
eat the supernoodles tonight, have rice and tina salad with tomato sauce tomorro for lunc / dinner, try and go shopin tomorrow.
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Willa
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#11332
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#11332
i gave up on that question, i'm now on trying to express tanh-1 as a logarithm! any help?
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Camford
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#11333
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#11333
(Original post by Willa)
i gave up on that question, i'm now on trying to express tanh-1 as a logarithm! any help?
what's tanhx in exponential? (e^x-e^-x)/(e^x+e^-x) = tanhx. solve for x as if you are dealing with an quadratic eqtn in e^x.
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Willa
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#11334
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#11334
how can you multiply something like that into a quadratic exactly...i'm being v slow tonight
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Camford
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#11335
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#11335
let that thingumy = y. multiply top and bottom by e^x. and solve for e^2x.
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Camford
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#11336
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#11336
I'm procrastinating... I don't want to do read my physics lab handbook. Will, we get to play that thingumy tomorrow, don't we? Last practical of this term. Yipee!! But I am slightly depressed with the thoughts of going home... without anyone to talk to... without internet...
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Camford
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#11337
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#11337
http://www.goyk.com/flash.asp?path=265
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Willa
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#11338
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#11338
but then you have (e^2y - 1)/(e^2y+1)....where do you go from there to get a nice quadratic of e^x?
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Camford
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#11339
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#11339
where's the y from?

(e^x - e^-x)/(e^x + e^-x) = y
(e^2x - 1)/(e^2x+1)=y
e^2x - 1=ye^2x +y
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Willa
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#11340
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#11340
blah i dont care any more

and i dont get the physics of the gyroscope either....the explanation in the manual is baffling...where it says that a rotation about the OP axis causes angular momentum change about the OY axis...that doesnt make sense at all!
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