Expression Parameters 
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Expression parameters define a parameter in terms of other parameters. Any indicated calculations will be evaluated.
$p = 4 $q = ($p+1)2 $r= $p + $q
Given these definitions, the following equation:
$p + $q + $r
would be rendered as
4 + 25 + 29
where $q is calculated as (4+1)^2 and $r is calculated as 4 + 25.
