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pretty complicated chain rule problem, i'd really appreciate some help on this one

what do you mean (du/dx)^2
is that the second derivative ?

no, its the square of du/dx

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no, its the square of du/dx

you mean have x+y be the function? f(x,y)=x+y?

yes, i copied it exactly.

what does it mean to find du/dx?

ok well thanks anyway for your help

Still there?

when you say u sub x times c, what is c?

Oh, sorry, I use "c" and "s" for cos(t), sin(t) here.

Where I write "NTS", that means, "need to show".

It's messy.

du/ds and du/dt...that comes from a result in calculus (chain rule for functions of many variables).

Is that okay?

yes, thank you.

You're welcome :)

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