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

    N should be 250
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    (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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