=sin(4π+π/6)+cos(8π+π/3)+tan(6π+π/4)=sinπ/6+cosπ/3+tanπ/4=1/2+1/2+1=2
=sin(25π/6)+cos(25π/3)+tan(-25π/4)=sinπ/6+cosπ/3-tanπ/4=1/2+1/2-1=1
