Template talk:Demo of attempt to use parameters within TeX
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{{Demo of attempt to use parameters within TeX|4||abc=def}} and {{Demo of attempt to use parameters within TeX|6||abc=def}}
give
Time Complexity: O(bd + 1)
Space Compexity: O(bd + 1)
Complete
Optimal
Time Complexity: O(bd + 1)
Space Compexity: O(bd + 1)
Complete
Optimal
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 \sqrt[n]{x}</math>}} gives: ![\frac{a}{b} = e^2 \sqrt[n]{x}](http://upload.wikimedia.org/math/8/5/c/85c487a0e7891f23204c3fafecfc0c30.png)
![\frac{a}{b} = e^2 \sqrt[n]{x}](http://upload.wikimedia.org/math/8/5/c/85c487a0e7891f23204c3fafecfc0c30.png)