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You can get all different kinds of sizes of parentheses, brackets, curly brackets, etc. to make your formulas look good. Typing

$$ \Biggl( \biggl( \Bigl( \bigl( ( ) \bigr) \Bigr) 
   \biggr) \Biggr) $$
gives you


Analogous commands work for [ and \{. Note the tex2html_wrap_inline3271 used to get curly braces.

You can also let tex figure out how big a pair of parentheses should be to fit the contained expression. Use \left( and \right), like this:

$$ \left(\sum a_i^2\right)^{1/2} $$


Of course, you can also use \left[, \right], \left\{ and \right\}.

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