User:Artyr91/sandbox

$$x_a= \frac\sqrt{-b^2+4} {\sin x}$$

$$\lim_{x\rightarrow 0} \int\limits_{-\infty}^{\infty}e^{x_1+x_2}\,dx$$

$$f(n)=1+\frac {1} {1+\frac {1}{n+\frac{1}{n}}}$$

\begin{bmatrix} 1 & 2 & 3 \\4 & 5 &6 \\7 & 8 & 9 \end{bmatrix}=0