求值:sin(π/4)cos(19π/6)tan(21π/4)急!
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
1.已知tan2分之α=2,求值:⑴ tan(α+4分之π);⑵ (6sinα+cosα)/(3sinα-2cosα)
sin(-21π/4) cos(-20π/3) tan(-19π/6)=
已知tanα=2,求值√2sin(α+π/4)/1+sinα-2cos^2α/2
求值:⑴sin(-19π/3)*cos(19π/6)
求值tan(kπ+π/6)cos(kπ-4π/3),k属于z
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
cos(9π/4)+tan(-7π/6)+sin(21π)=
求值:1.cos(-14π/3) 2.tan(35π/6) 3.sin(-25π/6)
化简求值,sin(2a-π)tan(π+a)cota/cos(π-a)tan(3π-a)
已知tanα/2=2,1.求tan(α+π/4)的值 2.(6sinα+cosα)/(3sinα-2cosα)的值