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How can I put brackets under a certain equation like this?

here

This is not a duplicate of this because I've tried the solution and this is what I get:

get

This is my code:

\[\underbrace{\sqrt{2+\sqrt{2+\sqrt{2+...+\sqrt{2}}}}_\text{$n$ nested square roots}} = 2\cos({\frac{\pi}{2^{n+1}}})\]
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  • Welcome to TeX.SX! Please convert your snippet into a complete minimal working example (MWE) including the document class.
    – epR8GaYuh
    Commented Sep 25, 2020 at 7:08

1 Answer 1

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Welcome to TeX.SE... You almost did, just a small change need to get your output, to keep subscript for the underbrace will meet the requirement, modified MWE is:

\[
\underbrace{\sqrt{2+\sqrt{2+\sqrt{2+...+\sqrt{2}}}}}_{\text{$n$
nested square roots}} = 2\cos\left({\frac{\pi}{2^{n+1}}}\right)
\]

PS: I've introduce \left and \right to increase the bracket size to cover the fraction size...

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    Thank you! I was also going to google to get bigger bracket but you also solved this haha. Commented Sep 25, 2020 at 6:39

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