Parentheses and brackets are very common in mathematical formulas. You can easily control the size and style of brackets in LaTeX, this article explains how.
Contents 
The size of the brackets can be manually set, or they can be resized dynamically in your document, as shown in the next example:
Notice that to insert the brackets, the \left
and \right
commands are used. Even if you are using only one bracket both commands are mandatory.
The size of the brackets can be controlled explicitly
The commands \Bigg
and \bigg
stablish the size of the delimiters <
and >
respectively. For a complete list of parentheses and sizes see the reference guide.
LaTeX markup  Renders as 

\big( \Big( \bigg( \Bigg(


\big] \Big] \bigg] \Bigg]


\big\{ \Big\{ \bigg\{ \Bigg\{


\big \langle \Big \langle \bigg \langle \Bigg \langle


\big \rangle \Big \rangle \bigg \rangle \Bigg \rangle
