a derivative of function is marked as(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\frac{\mathrm{df} }{\mathrm{d} x}

[/tex]

why the double derivative is marked as

[tex]

\frac{\mathrm{d^2f} }{\mathrm{d} x^2}

[/tex]

i tried to build it using the original definition

[tex]

\frac{d\frac{\mathrm{df} }{\mathrm{dx}} }{dx}

[/tex]

its not working

??

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# Double derivative definition question

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