> LyX v2.5.0
>
> An incorrect substitution of the symbol \theta is made:
> cos(a+\theta)=\cos\left(\vartheta+a\right)
>
This is a maxima thing, not a LyX bug. LyX correctly sends theta, but maxima
returns a tex string that contains \vartheta .
If you want to change this behavior, put the line
texput("theta","\\theta”)$
in your maxima-init.mac file (which likely resides in a hidden “.maxima” folder
inside your home folder).
Best,
Fatihcan
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