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I would very much appreciate a definition clarification.

Suppose we have 2 functions of a variable $x$: $f(x)$ and $g(x)$

And we have that $$f'^2+g=c$$ where $c$ is a constant

What does it mean to sketch the 2D surface?

What against what?

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I don't know either. Are you sure you are not missing a part of the statement? – user53153 Mar 1 at 21:56

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