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\(\displaystyle \frac{a}{b}\)

\(\displaystyle \int_{a}^{b} x^2 \,dx\)

\(\displaystyle \iint_{D} f(x,y) \,dx\,dy\)

\(\displaystyle \sum_{i=1}^{n} i = \frac{n(n+1)}{2}\)

\(\displaystyle \prod_{i=1}^{n} x_i\)

\(\displaystyle \lim_{x \to \infty} \frac{1}{x} = 0\)

\(\displaystyle \frac{\partial^2 f}{\partial x^2}\)

\(\displaystyle x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\)

\(\displaystyle \begin{pmatrix} a & b \\ c & d \end{pmatrix}\)

\(\displaystyle \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}\)

\(\displaystyle \begin{vmatrix} a & b \\ c & d \end{vmatrix} = ad - bc\)

\(\displaystyle f(x) = \begin{cases} x & \text{se } x \ge 0 \\ -x & \text{se } x < 0 \end{cases}\)