A Mathematical Cipher [cIosed]

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I’m just learning to use $mathrm{LaTeX}$, and I need practice, so I made this cipher puzzle.
EDIT: Oh, no… My question got closed!!!! Please explain why in your answer!

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Code:

$dfrac{1}{16}sqrt{s(18}.00sqrt{-1.5} dfrac{1}{10}sqrt{16}dfrac{1}{2}dfrac{1}{10} dfrac{1}{15750}sqrt{xy18}dfrac{1}{2} dfrac{1}{10}begin{matrix}nkend{matrix}Box2)!!overline{ 21}dfrac{1}{2} $ $overline{)}dfrac{1}{18}4)!!overline{ 12}2)!!overline{ 21}sqrt{5}overline{Large{3}}overline{.5}overline{Large{3}}overline{.5}Box dfrac{1}{16}overset{uparrow}{bigodot}dfrac{1}{2} overline{Large{3}}dfrac{1}{100} overline{Large{3}}dfrac{1}{10} overline{)(}2)!!overline{ 21!500}dfrac{1}{10}overline{s-b}Box$

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Question: Solve this cipher and find the hidden three-word phrase.

Sorry for my low-quality cryptic-clue…

Hint 1:

Hint 2:

Hint 3:

Hint 4: