hello,
What is wrong here ? I can’t get a numerical value.
jmac2050
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int = Integrate[1/(x^3 - 1), x];
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Thanks, it works now …
It is the square brackets around f'[x]. In WL the square brackets are used only to wrap the arguments of a function, never to indicate the order of operation. Either turn those brackets into round parentheses () or (in this case) remove them entirely:
Sqrt[1+(f'[x])^2]
Sqrt[1+f'[x]^2]