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# C3 Differentiation Watch

1. Hi guys

Is anybody able to tell me what the happens in part b in the last step of the model answer?

Thanks 😄
2. Common denominator in the square root.
3. (Original post by jasminetwine)
Hi guys

Is anybody able to tell me what the happens in part b in the last step of the model answer?

Thanks 😄
Specifically: so .

Hence:

GLORIOUS LATEX.
4. (Original post by Zacken)
Specifically: so .

Hence:

GLORIOUS LATEX.
Thank you very much Zacken

I'm not sure I would have ever spotted that!

Do you think a student would still be able to achieve full marks if the answer was left unsimplified as dy/dx=+- 1/(8(1-1/16x^2)) (i.e. The penultimate line)?
5. (Original post by jasminetwine)
Thank you very much Zacken

I'm not sure I would have ever spotted that!

Do you think a student would still be able to achieve full marks if the answer was left unsimplified as dy/dx=+- 1/(8(1-1/16x^2)) (i.e. The penultimate line)?
I'm not entirely sure, but unless asked for a specific form, I don't think they should lose any marks.
6. (Original post by NotNotBatman)
Common denominator in the square root.
That is right! you have razor-sharp eyes for understanding mathematical steps.

(Original post by jasminetwine)
Hi guys

Is anybody able to tell me what the happens in part b in the last step of the model answer?

Thanks 😄
What about the steps before? did you understand them? well.

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