it is sin (x-[x])/cos(x-[x])
so tan(x-[x])
=tan{x}
now it should be easy
thats [] integral part ??
oh i think this is not that tough as it may seem, but gud question...
The definite integral cant be solved i think so
please reply and correct me if i was wrong...

The reqd area is going upto infinity and for o to ∩/2 and ∩ to 3∩/2
and it is going to -infinity for ∩/2 to 2∩ and 3∩/2 to 2∩