You are Here: Home >< Maths

Differential equation

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
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?

Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: September 13, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

Maths Forum posting guidelines

Not sure where to post? Read here first

How to use LaTex

Writing equations the easy way

Study habits of A* students

Top tips from students who have already aced their exams

Chat with other maths applicants