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# C4 maths Watch

1. Hello, this question of mine is related to integration unit of C4:

Integration using substitution,
When we end up with u as the final thing , and the substitution we made initially was x=tan u , how do we get the answer back in terms of x ?

because we surely cannot leave the final answer in forms of u right?
2. (Original post by laurawoods)
Hello, this question of mine is related to integration unit of C4:

Integration using substitution,
When we end up with u as the final thing , and the substitution we made initially was x=tan u , how do we get the answer back in terms of x ?

because we surely cannot leave the final answer in forms of u right?
For definite integrals yes. If indefinite then no, you must convert back using arctan.
3. (Original post by laurawoods)
Hello, this question of mine is related to integration unit of C4:

Integration using substitution,
When we end up with u as the final thing , and the substitution we made initially was x=tan u , how do we get the answer back in terms of x ?

because we surely cannot leave the final answer in forms of u right?
4. (Original post by Mr M)
thanks to both answers- joostan and Mr M. !
5. (Original post by laurawoods)
thanks to both answers- joostan and Mr M. !
np
6. (Original post by joostan)
np
Pls can u answer this maths question of mine

Hello, if we have something like y+1 to integrate, don't we get y^2/2 + y

Pls can you look at the solution to question no 4 on this paper:
http://papers.xtremepapers.com/Edexc...d%20H%20MS.pdf

They went about a different way ...do u think my method would be fine ...because I got the same answer as them >...
7. (Original post by laurawoods)
Pls can u answer this maths question of mine

Hello, if we have something like y+1 to integrate, don't we get y^2/2 + y

Pls can you look at the solution to question no 4 on this paper:
http://papers.xtremepapers.com/Edexc...d%20H%20MS.pdf

They went about a different way ...do u think my method would be fine ...because I got the same answer as them >...
If you get the same answer then I imagine its fine.
(Original post by Mr M)
...
to be 100% sure but I think they should have put:
8. (Original post by Mr M)
If we have something like y+1 to integrate, don't we get y^2/2 + y

Pls can you look at the solution to question no 4 on this paper:
http://papers.xtremepapers.com/Edexc...d%20H%20MS.pdf

They went about a different way ...do u think my method would be fine ...because I got the same answer as them >...[/B]
9. (Original post by laurawoods)
Pls can u answer this maths question of mine

Hello, if we have something like y+1 to integrate, don't we get y^2/2 + y

Pls can you look at the solution to question no 4 on this paper:
http://papers.xtremepapers.com/Edexc...d%20H%20MS.pdf

They went about a different way ...do u think my method would be fine ...because I got the same answer as them >...
both methods are fine - they've just used "recognition" because
10. (Original post by laurawoods)
If we have something like y+1 to integrate, don't we get y^2/2 + y

Pls can you look at the solution to question no 4 on this paper:
http://papers.xtremepapers.com/Edexc...d%20H%20MS.pdf

They went about a different way ...do u think my method would be fine ...because I got the same answer as them >...[/B]
11. (Original post by Mr M)
cool thanks and yes I remembered the constant of integration

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