Invalid command \sin'

[charlesroddie]

The math parser doesn't like the following:

\sin'
\mu=
\left{ \frac{-b}{2a} \right}
$35.99 \%$

Errors:

Error: [Math] Invalid command \sin'
Error: [Math] Invalid command \mu=
Error: [Math] Invalid delimiter {
Error: Missing closing brace

[Happypig375]

This is related to how commands are parsed. It is hard to know whether ' and = are part of the command name or are their own symbols after commands. More digging around LaTeX documentation is needed.