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# Maths c4 differentiation

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1. Maths c4 differentiation

after differentiating x3, you get 3x2, why don't you write down dx/dy next to it? (like is done with the others..).. I remember vaguely that it cancels or something?
2. Re: Maths c4 differentiation
You're differentiating each term with respect to x. If the term is just a function of x, this means you just differentiate it normally, as nothing you're doing has anything to do with y.
3. Re: Maths c4 differentiation

Whereas

Last edited by TenOfThem; 04-06-2012 at 17:07. Reason: ooops
4. Re: Maths c4 differentiation
(Original post by TenOfThem)

Whereas

Thanks, but I am confused , where did the y squared come from?
5. Re: Maths c4 differentiation
(Original post by sabre2th1)
Thanks, but I am confused , where did the y squared come from?
If you know where the x^2 came from why don't you know where the y^2 came from
6. Re: Maths c4 differentiation
The dy/dx comes from the chain rule:

where f(y) is a function of y. If f(y) is y^3 then it becomes what TenOfThem posted.
Last edited by F1Addict; 04-06-2012 at 15:19.
7. Re: Maths c4 differentiation
(Original post by TenOfThem)

Whereas

differentiating y^2 doesn't give you 3y^2 which is what is confusing.
8. Re: Maths c4 differentiation
(Original post by delllboy)
differentiating y^2 doesn't give you 3y^2 which is what is confusing.
Thanks ... I had it in the second bracket with an error in the first

Corrected now

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Last updated: June 4, 2012
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