求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)

求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11) 求值：cos(π/11)-cos(2π/11)+cos(3π/11)-cos(4π/11)+cos(5π/11) cos(3π/2 - π/3),求值 sin(π+π/6)-cos(π+π/4)cos(-π/2)+1求值 化简求值cos(π/7)cos(2π/7)cos(4π/7) 求值：cos²A+cos²（2π/3+A)+cos²(2π/3-A) 已知sin(3π+θ)=lg1/(10开3次方）,求值cos（π+θ）/cosθ{cos(π-θ)-1} + cos(θ-π)/cos(π-θ)+cos(更正：已知sin(3π+θ)=lg1/(10开3次方），求值cos（π+θ）/cosθ{cos(π-θ)-1} + cos(θ-π)/cos(π-θ)+cos(θ-2π） 高一数学 求cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)(5/24)(11/24)=5/11?,而且过程和题好像都没关系。 求值：﹙1﹚arc sin﹙sin1﹚ ﹙2﹚arc cos﹙cosπ／12﹚ cos^2(π/5)+sin^2(π/10) 求值 求值：sin(π/12)+cos(π/12) 求值cos5π/8*cosπ8 求值:2cosπ/2-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6+sin3π/2 -1/4cosπ 求值：cos（25π /4） cos（-8π/3）求值 cos（-8π/3）求值 求值:cos(-6分之31π) 求数学高手帮忙cos(2π/7)+cos(4π/7))+cos(6π/7)=?(化简求值)