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$\frac{\partial a}{\partial b}$
$\frac{\text{d}x}{\text{d}y}$
$\lim_{a \rightarrow b}$

$\displaystyle\sum\limits_{i=0}^n i^3$
$\left(\begin{array}{c}a\\ b\end{array}\right)$
$\left(\frac{a^2}{b^3}\right)$
$\left.\frac{a^3}{3}\right|_0^1$
$\begin{bmatrix}a & b \\c & d \end{bmatrix}$
$\begin{cases}a & x = 0\\b & x > 0\end{cases}$
$\sqrt{\frac{n}{n-1} S}$
$\begin{pmatrix} \alpha& \beta^{*}\\ \gamma^{*}& \delta \end{pmatrix}$
$A\:\xleftarrow{n+\mu-1}\:B$
$B\:\xrightarrow[T]{n\pm i-1}\:C$
$\frac{1}{k}\log_2 c(f)\;$
$\iint\limits_A f(x,y)\;$
$x^n + y^n = z^n$
$E=mc^2$
$e^{\pi i} - 1 = 0$
$p(x) = 3x^6$
$3x + y = 12$
$\int_0^\infty \mathrm{e}^{-x}\,\mathrm{d}x$
$\sqrt[n]{1+x+x^2+\ldots}$
$\binom{x}{y} = \frac{x!}{y!(x-y)!}$
$\frac{\frac{1}{x}+\frac{1}{y}}{y-z}$
$f(x)=\frac{P(x)}{Q(x)}$
$\frac{1+\frac{a}{b}}{1+\frac{1}{1+\frac{1}{a}}}$
$\sum_{\substack{0\le i\le m\\ 0\lt j\lt n}} P(i,j)$
$\lim_{x \to \infty} \exp(-x) = 0$
$\cos (2\theta) = \cos^2 \theta - \sin^2 \theta$

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$\leftrightsquigarrow$

$\aleph$
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$\nsupseteqq$
$\bigodot$
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$\bigoplus$
$\biguplus$

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$\tiny Tiny$
$\scriptsize Script$
$\small Small$
$\normalsize Normal$
$\large large$
$\Large Large$
$\LARGE LARGE$
$\huge huge$
$\Huge Huge$
$\mathbf{Bold}$
$\mathit{Italic}$
$\mathrm{Roman}$
$\mathcal{Mathcal}$
$\mathscr{Script}$
$\mathfrak{Fraktur}$
$\mathbb{Blackboard}$
$\mathsf{Sans Serif}$
$\mathtt{Typewriter}$

${\color[RGB]{0,255,255} Aqua}$
${\color[RGB]{0,0,0} Black}$
${\color[RGB]{0,0,255} Blue}$
${\color[RGB]{255,0,0} Red}$
${\color[RGB]{0,255,0} Lime}$
${\color[RGB]{255,255,0} Yellow}$
${\color[RGB]{255,0,255} Magenta}$
${\color[RGB]{192,192,192} Silver}$
${\color[RGB]{128,128,128} Gray}$
${\color[RGB]{128,0,0} Maroon}$
${\color[RGB]{128,128,0} Olive}$
${\color[RGB]{0,128,0} Green}$
${\color[RGB]{128,0,128} Purple}$
${\color[RGB]{0,128,128} Teal}$
${\color[RGB]{0,0,128} Navy}$
${\color[RGB]{250,128,114} Salmon}$
${\color[RGB]{255,127,80} Coral}$
${\color[RGB]{255,69,0} Orange red}$
${\color[RGB]{255,165,0} Orange}$
${\color[RGB]{255,215,0} Gold}$
${\color[RGB]{0,128,0} Green}$
${\color[RGB]{100,149,237} Corn}$
${\color[RGB]{75,0,130} Indigo}$
${\color[RGB]{216,191,216} Thistle}$
${\color[RGB]{160,82,45} Sienna}$
${\color[RGB]{210,105,30} Chocolate}$
${\color[RGB]{210,180,140} Tan}$
${\color[RGB]{112,128,144} Slate Gray}$
${\color[RGB]{105,105,105} Dim Gray}$
${\color[RGB]{199,21,133} Violet}$
${\color[RGB]{30,144,255} Dodg Blue}$
${\color[RGB]{46,139,87} Sea Green}$
${\color[RGB]{184,134,11} Dark Gold}$
${\color[RGB]{165,42,42} Brown}$