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\textstyle \frac{x}{y} \frac{x}{y}
\textstyle \sum_x^n \sum_{x=1}^{n}
\textstyle \prod_x^n \prod^{x=1}_{n}
\textstyle \int_a^b \int_{a}^{b} f (x)\,dx
\textstyle \frac{\partial x}{\partial y} \frac{\partial x}{\partial y}
\textstyle \sqrt x \sqrt{x}
\textstyle \sqrt[3]{x} \sqrt[3]{x}
\textstyle f(x) f(x)
\lim \lim_{x\to\infty}
***
\sin \sin (x)
\cos \cos (x)
\tan \tan (x)
\log \log (x)
\ln \ln (x)
***
\le \le
\ge \ge
\neq \neq
\approx \approx
\equiv \equiv
\propto \propto
\infty \infty
***
\alpha \alpha
\beta \beta
\gamma \gamma
\delta \delta
\epsilon \epsilon
\zeta \zeta
\eta \eta
\theta \theta
\vartheta \vartheta
\kappa \kappa
\lambda \lambda
\mu \mu
\xi \xi
\pi \pi
\rho \rho
\sigma \sigma
\tau \tau
\phi \phi
\varphi \varphi
\chi \chi
\psi \psi
\omega \omega
***
\Rightarrow \Rightarrow
\rightarrow \rightarrow
\Leftarrow \Leftarrow
\leftarrow \leftarrow
\Leftrightarrow \Leftrightarrow
\vec{x} \vec{x}
***
( \left(
) \right)
[ \left[
] \right]
\{ \left{
\} \right}
\textstyle {n \choose k} {n \choose k}
***
\Box \Box
\forall \forall
\exists \exists
\in \in
\not\in \not\in
***
\mbox{Taylor} f(x) = \sum_{k=0}^{\infty } \frac{ f^{k} (a) }{ k! } (x - a)^k
\mbox{Euler}^1 e^{i \varphi } := \cos \varphi + i \sin \varphi