sinπ/12+√3cosπ/12的值是多少?(“√”是更号)

sinπ/12-√3cosπ/12的值 sin(25π/12)cos(11π/6)-cos(25π/12)sin(11π/6)的值是 已知sin[a-b]cos a-cos[b-a]sin a=3/5,b是第三象限角,求sin[b+5π/4]的值第一题1/2cos x-√3/2sin x第二题√3sin x+cos x第三题√2[sin x-cos x]第四题√2cos x-√6sin x cosπ/12+(根号3)×sinπ/12的值 sinπ/12-根号3cosπ/12的值 （cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为 若方程12x²+πx-12x=0的两的根分别是α,β,则cosαcosβ-√3sinαcosβ-√cosαsinβ-sinαsinβ= 已知sin(7π-α)-3cos(3π/2+α)=2,则(sin(π-α)+cos(π+α))/(sinα+cos(-α))的值是 已知sin(7π-α)-3cos(π-α)=2,则(sin(π-α)+cos(π+α))/(sinα+cos(-α))的值是 已知sin(7π-α)-3cos(π-α)=2,则(sin(π-α)+cos(π+α))/(sinα+cos(-α))的值是 1.已知cosα=12/13,α∈(3π/2,2π),求cos(α+π/4).2.cos(α+β)=1/3,则(sinα-sinβ)^2+(cosα+cosβ)^2=?3.已知sinα=(√5)/5,sinβ=(√10)/10,α、β都是锐角,求cos(α+β)及α+β的值.4.已知锐角α、β满足sinα=(√5)/5,cosβ(√10)/1 请会的大哥大姐多多指教.已知sinθ=(√5-1)/4(1)求(sinθ-cosθ)/(sinθ+cosθ)+(sinθ+cosθ)/(sinθ-cosθ)的值.(2)已知5sinθ+12cosθ=0,求(sinθ+9cosθ)/2(2-3sinθ)的值. sinπ/12+√3cosπ/12的值是多少?(“√”是更号) sin(π/12)cos(π/12)的值 化简sin（25π/12）cos（11π/6）-cos（11π/12）sin（5π/6）的值是 设sinθ+cosθ=√2/3,π/2sinθ^3是sinθ的3次 √3cosπ/12-sinπ/12= sin²α+√3sinαcosα-2cos²α=0,α∈(π/6,5π/12),求：(1)sin(2α－π／3)的值.(2)cos2α的值··