Overbrace and Underbrace

`\overbrace, \underbrace`

Note: click with the right mouse button on any WebEQ equation to bring up a font size control panel.

\overbrace{a} + \underbrace{a+b+c+d+E} +
\overbrace{\sqrt{b+c+15.4} - \cos 2.3\pi \times 41}

\left \{ \overbrace{\underbrace{\frac{2x+3}{\log_{10} 2x^2}}} \right \}

=

\underbrace{\overbrace{ \left \{ \frac{2x+3}{\log_{10} 2x^2} \right \}
                      }
           }

More information on these commands may be found in Mathematical Expressions: Placing symbols over or under an expression of the WebTeX documentation.