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    and also dy/dx of dy/du?
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    If you are talking about the chain rule then dy/dx = dy/du x du/dx
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    I'm assuming you're referring to differential calculus. dy/dx is the relationship between the derivative of the function and x.

    du/dx is usually used when a chain function is being derived, for example (10x^2+5x)^5 , where we later use the notation u^5. Thus, the derivative would be dy/du = 5u^4.


    It is hard to explain it without having a specific example given. Hope it helps anyway, at least a bit. I'm sure other users can go a bit more in-depth :P
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    if you mean d/du(dy/dx) then that would be d2y/dx2*dy/du
 
 
 
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