求值sin^4(π/8)+cos^4(π/8) 答对有分`
8sin(π/32)cos(π/32)cos(π/16)cos(π/8),求值
求值:sin(π/12)+cos(π/12)
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(-
不用计算器求值sinπ\8 cosπ\8=sin^2 π\12-cos^2 π\12=化简:(cosx+sinx)^2=
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cos5π/8*cosπ8
求值:cos(25π /4)
求值:sin(π/4+3x)cos(3/π-3x)+cos(π/6+3x)cos(π/4+3x)
求值:⑴sin(-19π/3)*cos(19π/6)
求值:1-sin^6a-cos^6a/1-sin^4a-cos^4a