1.sin (25/6)π +cos(25/3)π + tan (-25/4)π (π是和分数相乘的)
sin(4π/3)*cos(25π/6)*tan(-3π/4)
sin(-4π/3)cos(-23π/6)tan(25π/4)=?
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
已知tanα/2=2,1.求tan(α+π/4)的值 2.(6sinα+cosα)/(3sinα-2cosα)的值
已知tanα/2=2求tan(α+π/4)的值(6sinα+cosα)/(3sinα-2cosα)的值
三角函数sin、cos、tan的π/几都可以化成分数·比如sinπ/3=根号3/2那其他的π/6、π/12呢
sin25π/6+cos10π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)=
求值:1.cos(-14π/3) 2.tan(35π/6) 3.sin(-25π/6)
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
求sin25π/6+cos5π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-5π
若α∈(0,π/6) 比较tan(sinα),tan(cosα),tan(tanα)的大小
已知tan(α+π/4)=3,求cosα+2sinα/cosα-sinα的值