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# C4 differential help waaat

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1. Have a derivative and it tells me to find max. To me it looks like when dy/dx=0, N=500 but apparently it's 250

Help pls?
Thx
2. You have to differentiate again. d^2(y)/dx^2 = 0

N should be 250
3. (Original post by Shumaya)
You have to differentiate again. d^2(y)/dx^2 = 0

N should be 250
Oh okay thanks a mil

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