Template:Demo of attempt to use parameters within TeX

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$1 + a b c$

$C U R R E N T D A Y C U R R E N T D A Y$

$t c t c$

Failed to parse (lexing error): {{#expr:2+3}}

Compare using "#tag:math":

$1 + a b c$

$14 C U R R E N T D A Y$

$i n t c$

$5$

For a={{{1}}}, Expression error: Unrecognised punctuation character "{".

{{{1}}}Expression error: Unrecognised punctuation character "{".