Template talk:Demo of attempt to use parameters within TeX
{{Demo of attempt to use parameters within TeX|4||abc=def}} and {{Demo of attempt to use parameters within TeX|6||abc=def}}
give
Attempt to use template parameters within <math>...</math>:
Failed to parse (syntax error): {\displaystyle {{#expr:2+3}}}
Compare using "#tag:math":
For a=4,
4
Attempt to use template parameters within <math>...</math>:
Failed to parse (syntax error): {\displaystyle {{#expr:2+3}}}
Compare using "#tag:math":
For a=6,
6
Conclusion: parameters are not substituted, {{{1}}} is interpreted as 1, etc.
However, math tags inside a template parameter are allowed:
{{x2|<math>\frac{a}{b} = e^2</math>}} gives: