> 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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