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Math Help - Derivate

  1. #1
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    Derivate

    How do I derivate this ln(x^3 +1)


    thank you
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  2. #2
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    Quote Originally Posted by Makron View Post
    How do I derivate this ln(x^3 +1)


    thank you
    Use the chain rule.

    If you need more help I suggest you first review all relevant examples in your class notes and textbook. Then, if you still need more help, please post all your work and say where you get stuck.
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  3. #3
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    Quote Originally Posted by Makron View Post
    How do I derivate this ln(x^3 +1)


    thank you
    You have to use the chain-rule:

    (Since the LaTeX-compiler doesn't work here the simple calculation

    f(x)=ln(x^3+1) ==> f'(x)=1/(x^3+1) *d(x^3+1)/dx

    Simplify the RHS of the equation.
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  4. #4
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    Or to use the simpler notation...

    Let u = x^3 + 1 so that y = ln(u), and note that dy/dx = (du/dx)(dy/du)
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