求值:sin(-31π/6)-cos(-10π/3)-sin11π/4
sin11/π*sin11/3π*sin11/5π分之sin11/10π*sin11/8π*sin11/6π 等于多少
求值:⑴sin(-19π/3)*cos(19π/6)
求值:sin(π/12)+cos(π/12)
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
化简求值sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)
求三角函数值.(1)cos 225¤ (2)sin(-3分之1派) (3)sin11分之6派 (4)计算1+tan 15
化简求值:sin(π/4-3x)*cos(π/3-3x)-cos(π/6+3x)*sin(π/4+3x)
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(π/4+3x)cos(3/π-3x)+cos(π/6+3x)cos(π/4+3x)
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
求值:sin(-3分之19π)+cos(-6分之25π)=?
sin^a+cos^(π/6+a)+1/2sin(2a+π/6)求值