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# Differential Equations watch

1. Hello,

I have not yet studied differential equations and have come across a proof that, I think, involves them.

If possible, could someone please explain to me how, if x=az, dx=adz.

Additionally, how, if x=(z^n), dx=n(z^(n-1))

Thank you
2. The notation is sloppy notation which is only used when you intend to do something else with it. What it means is that , which is fairly obvious given that !

Similarly, if then . We can write when it's convenient, but only for the sake of notation.
3. (Original post by nuodai)
The notation is sloppy notation which is only used when you intend to do something else with it. What it means is that , which is fairly obvious given that !

Similarly, if then . We can write when it's convenient, but only for the sake of notation.
Thank you very much. You have helped me lots today and both on questions I really should have been able to do myself. I am rusty

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