1. Quadratic formula

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

2. Integrals

\int_a^x \int_a^s f(y)\,dy\,ds

= \int_a^x f(y)(x-y)\,dy

3. Fractions

\frac{1}{2} or \tfrac {1}{2}

4. Array

\begin{array}{|c|c||c|} a & b & S \\

\hline

0&0&1\\

0&1&1\\

1&0&1\\

1&1&0\\

\end{array}

5. Midpoint Formula

M = \left( \frac{x_1 + x_2}{2}, \frac{y_1+y_2}{2}\right)

6. Slope Formula

\frac{y2-y1}{x2-x1}

7. Distance Formula

M_1M_2 = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}