User:Demeteron/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$$



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