Code:x^2
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}