Practice
This is practice page with tasks
\[
\left(
\sum_{i=1}^{n} \int_{0}^{\infty} \frac{x^{\alpha_i - 1}}{e^{\beta_i x} - 1} \, dx
\right)=
\prod_{i=1}^{n} \Gamma(\alpha_i)\zeta(\alpha_i)\beta_i^{-\alpha_i}
\]
Inline variant
\( \int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi} \)
More than one expession
\[
\sum_{n=1}^{\infty} \frac{1}{n^2} = \frac{\pi^2}{6}, \quad
\lim_{x \to 0} \frac{\sin x}{x} = 1
\]