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I was googling about the sign for square root on the keyboard and found command+v but when I press it, it gives math eq like 2*2+2*2+2. It is like it is built into it. why does the command+v gives you such math eq? and as a developer what can I use to denote square root?

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You mean this… ?

That's on Opt ⌥ V

There are no characters/glyphs accessed by the Cmd ⌘ key at all. Cmd ⌘ V is Paste.
You can find more complex glyphs using the Character Viewer [Emoji & Symbols]. Double-click the glyph in the viewer to enter it at the caret.

Image showing both on-screen keyboard [slightly different design on newer macOS, this is from Mojave] with the Character Viewer below, searching 'root'.

enter image description here

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