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Old 02-01-2009: 2nd January 2009 19:58 #1 
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Default Differential equations
 
HELP! im doing revision for C4 and just realised i remember nothing on how to do differential equations
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Old 02-01-2009: 2nd January 2009 20:00 #2 
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Default Re: Differential equations
 
does this help?
 
Old 02-01-2009: 2nd January 2009 20:00 #3 
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Default Re: Differential equations
 
If you have an equation in the form

dy/dx = f(x)g(y)

Then you can solve it by noting that

\int \frac{1}{g(y)} \mathrm{d}y = \int f(x) \mathrm{d}x

That's about it really (the above is called separating the variables).
 
Old 02-01-2009: 2nd January 2009 20:01 #4 
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Default Re: Differential equations
 
Originally Posted by qazaqaz
HELP! im doing revision for C4 and just realised i remember nothing on how to do differential equations
Sucks to be you. Find your C4 textbook. Read it. Do some questions.
Old 02-01-2009: 2nd January 2009 20:55 #5 
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Default Re: Differential equations
 
The only type of differential equation you'll get on C4 papers, if memory serves, are ones which require you to separate the variables. The wikipedia page isn't too bad.

http://en.wikipedia.org/wiki/Separation_of_variables
 
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