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- September 24th 2009, 11:53 PMmark1950[SOLVED] How to answer this question
Show that

given that - September 24th 2009, 11:55 PMProve It
- September 25th 2009, 01:34 AMmark1950
Yes, I can but what I got was a very, very long equation.

- September 25th 2009, 01:35 AMProve It
- September 25th 2009, 01:57 AMmr fantastic
- September 25th 2009, 02:32 AMmark1950
@Prove it

Dude, if I knew how to solve it, I would not have posted this question here.

@Mr. Fantastic

Thanks. After this step, I simply do not know how to continue. I tried substituting dy/dx into them but simply couldn't get rid of the exponential, e so as to prove that its right. You know what I mean, right?

- September 25th 2009, 02:39 AMProve It
- September 25th 2009, 02:48 AMmr fantastic
Your derivatives are OK. Now the unfortunate fact is that you need to substitute y and the derivatives into the left hand side of the differential equation. Then simplify it (hopefully to 4). This will take a fair bit of algebra but is not difficult - just very tedious (hence my use above of the word unfortunate).

- September 25th 2009, 02:49 AMProve It
- September 25th 2009, 02:53 AMmr fantastic
- September 25th 2009, 02:54 AMProve It
- September 25th 2009, 05:10 AMmark1950
Oh darn...I was looking for a simpler way but nvm...there are some things that can't be simplified. Thanks, anyway for the assurance that my derivatives are correct.