solving trigonometric equations



I am trying to solve a trigonometric equation (Xsub)? by using the following Maxima command:

solve(Xsub=0, lar);

below is the result:
[sin(lar) = 
??????????????????????????????????????????????????????????????????? 17/2
((3816460394775090135174727437710607637460869911045457719270324675 2
?- 6693003152878992961567584451453152982881158623271224341403880235191)
?cos(lar))/3858397820030840921077633857332889390016365893963513285370654170648\
3369204881]


I do not want the unknown (lar)? to appear in the rhs of the solution. 


Can anyone help me ?

Thanks, Sharon