\[ \neg( A \vee B) = \neg A \wedge \neg B \]

\[ \left( A \cup B \right) \setminus C \]

\[ \log_a(x) = \frac{\ln(x)}{\ln{a}} \]

\[ (a+b)^2 = a^2 + 2ab + b^2 \]

\[ \begin{array}{rrcl} & a x + b & = & 0 \\ \Leftrightarrow & ax & = & -b \end{array} \]

\[ - 2x < 4 \Leftrightarrow x > -2 \]

\[ \sum_{k=1}^n k = \frac{n(n+1)}{2} \]

\[ c^2 = a^2 + b^2 - 2 ab \cos(\gamma) \]