Sin（25π/6）+cos(25π/3）+tan(-25π/4)=Sin（4π+π/6）+cos(8π+π/3）+tan(-6π-π/4)=Sin（π/6）+cos(π/3）+tan(-π/4)=1/2+1/2 -1=0
等于0.5+0.5-1等于0
