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# Differential equation Watch

1. Find the general solution of the differential equation
.

This one's a bit harder than the baby one earlier.
2. (Original post by Ano123)
Find the general solution of the differential equation
.

This ones a bit harder than the baby one earlier.
What have you tried?
3. (Original post by Ano123)
Find the general solution of the differential equation
.

This one's a bit harder than the baby one earlier.
I would not know where to start
4. (Original post by IYGB)
I would not know where to start
http://www.wolframalpha.com/input/?i...y%3Dtan(ln(x))
5. Don't just cheat and use wolframalpha. Try the question.
6. (Original post by Ano123)
Don't just cheat and use wolframalpha. Try the question.
I would...
Spoiler:
Show
...if I knew where to even begin.
7. (Original post by Zacken)
What have you tried?
Classic transforms it to .
8. (Original post by Ano123)
Classic transforms it to .
Can you take it from there?

Hint: standard C.F and P.I works variation of parameters work
9. (Original post by Zacken)
Can you take it from there?

Hint: standard C.F and P.I works
PI?
10. (Original post by Ano123)
PI?
Ah yeah, should have tried it myself. Go for variation of parameters instead.
11. (Original post by Zacken)
Ah yeah, should have tried it myself. Go for variation of parameters instead.
Bingo.
12. Wot bludy hel is this.
Do i ned this for uni.

Posted from TSR Mobile
13. (Original post by physicsmaths)
Wot bludy hel is this.
Do i ned this for uni.

Posted from TSR Mobile
this is why you need to relearn DE's with me
14. (Original post by Ano123)
Find the general solution of the differential equation
.

This one's a bit harder than the baby one earlier.
Try differentiating it once or twice and see if you can substitute a fraction of the result(s) for tan(ln(x)) and set up through that sort of simultaneous equation an equation with fewer derivatives.
(Note that the derivative of x^3 is 3x^2 (the one to the right go the term of x^3 in and the same is true for all the powers of x in there, and that the derivatives of y have the opposite pattern, meaning hopefully a technique like above will make some ground.)
15. (Original post by Ano123)
Bingo.
I was looking the variation of parameters method on the net but I cannot find anything with 3 derivatives.
Are you making these up?

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