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Lateral surface of body of rotation

Posted 24 days ago

enter image description here

hello, What is wrong here ? I can't get a numerical value.

jmac2050

POSTED BY: Jürgen Maczioch
4 Replies

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]
POSTED BY: Gianluca Gorni

Thanks, it works now ....

POSTED BY: Jürgen Maczioch

POSTED BY: Mariusz Iwaniuk

Welcome to Wolfram Community! Please make sure you know the rules: https://wolfr.am/READ-1ST

The rules explain how to format your code properly. Posting code Images doesn't help other members to copy your code. Please EDIT your post and make sure code blocks start on a new paragraph and look framed and colored like this.

int = Integrate[1/(x^3 - 1), x];
Map[Framed, int, Infinity]

You can also embed notebook or attach notebook.

enter image description here

POSTED BY: Moderation Team
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