\[ E=mc^2 \]
\[ a^2 + b^2 = c^2 \]
\[ H_2O \]
\[ \mathrm{H}_{2} \mathrm{O} \]
\[ NH_3 \]
\[ \frac{12}{6} \]
\[ \frac{3}{4} + \frac{6}{7} \]
\[ \frac{8}{9} - \frac{7}{9} \]
\[ \frac{8}{9} \times \frac{8}{6} \]
\[ \frac{8}{9} \div \frac{7}{2} \]
\[ \sum_{i=1}^5 i \]
\[ \sum_{i=1}^n \frac{2i-1}{i(i+1)} \]
\[ \sum_{i=1}^{4}(3 i-1) \]
\[ \log_7{49}= 2 \]
\[ \log_6{216}=3 \]
\[ \log_3{81}=4 \]
\[ \begin{matrix} 14 & 18 & 5 \\ 7 & 9 & 12 \\ 10 & 7 & 2 \end{matrix} \]
\[ \begin{pmatrix} 14 & 18 & 5 \\ 7 & 9 & 12 \\ 10 & 7 & 2 \end{pmatrix} \]
\[ \begin{vmatrix} 14 & 18 & 5 \\ 7 & 9 & 12 \\ 10 & 7 & 2 \end{vmatrix} \]
\[ \begin{Vmatrix} 14 & 18 & 5 \\ 7 & 9 & 12 \\ 10 & 7 & 2 \end{Vmatrix} \]
\[ \sqrt{4} \]
\[ \sqrt{2} \]
\[ \sqrt{3} =1.7320508 \]