sin(-4分之π)求值
1.已知tan2分之α=2,求值:⑴ tan(α+4分之π);⑵ (6sinα+cosα)/(3sinα-2cosα)
求值:sin(-3分之19π)+cos(-6分之25π)=?
化简求值:sin(π4−3x
求值:sin(π/12)+cos(π/12)
求值:sin[1/2arctan(-4/3)]
求值4(cos40°-cos³40°)分之sin²80°乘以(1+√3tan10°)
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
求值,谢谢高手! 已知 Sin(α+3/4π)= 5/13
求值:sin(-6分之55拍)+cos(-3分之8拍)等于
不查表求值:cos5π/12·sinπ/12=
求值:⑴sin(-19π/3)*cos(19π/6)