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I need to use a new symbol to denote an operation defining by myself. How to establish a pair of new delimeters just as adding a little circle on left/right parentheses? The difficulty is there are four size of it: \big, \Big, \bigg, \Bigg.
\documentclass{article}
\begin{document}
\[\bigl\newlparentheses\sin(x+\pi)\bigr\newrparentheses
\cdot\Bigl\newlparentheses\frac ab\Bigr\newrparentheses\]
\end{document}
You can define new brackets.
For classic \left, \right as
\def\oright#1{\right#1\mskip-10mu\circ}
\def\oleft#1{\circ\mskip-10mu\left#1}
for big \bigl, \bigr as
\def\obigr#1{\bigr#1\mskip-8mu\circ}
\def\obigl#1{\circ\mskip-8mu\bigl#1}
and for extra big \Bigl, \Bigr as
\def\oBigr#1{\Bigr#1\mskip-8mu\circ}
\def\oBigl#1{\circ\mskip-8mu\Bigl#1}
Use it like:
\[\oleft(\sin(x+\pi)\oright)\]
\[\obigl(\sin(x+\pi)\obigr)\]
\[\oBigl(\sin(x+\pi)\oBigr)\]
The result will look like:
\documentclass{...}and ending with\end{document}