计算：sinπ／12 sin5π／12

计算：sinπ／12 sin5π／12 (sin5π/12-sinπ/12)(sin5π/12+sinπ/12)的值 急! 计算sinπ/12*sin5π/12我没有分了,知道的人就帮帮忙, (sinπ/12)-(sin5π/12)+(2sinπ/8)(sin3π/8) sinπ/12-sin5π/12+2sinπ/8sin3π/8 (sin5π/12+cos5π/12)(sinπ/12-cosπ/12) (sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=? sinπ /14*sin3π /14*sin5π /14 sin5π/3=sin(2π-π/3) 计算 sin5π/8*cos（7/8）π+sinπ/8-cos（3/8）π sinπ/18sin5π/18 sin（- 65π/18 sin之间为乘法sinπ/18sin5π/18 sin（- 65π/18sin之间为乘法 sin5/12π*cosπ/12 怎么算 cos5π/12-根3sin5π/12过程 求下列函数值 sin5π/12求下列函数值 1.sin5π/12 2.tanπ/12 SIN5/6π 比较大小：sin5分之8π ( )sin5分之9π 已知sin(α+β)=3/5,sinβ=1/2,α+β,β均为锐角,求sinα的值.已知sin(α+β)=3/5,cos（α-β）=1/3,α+β,α-β均为锐角,求sin2α、cos2β.求[（sin5π/12）+（cos5π/12）]·[（sin5π/12）-（cos5π/12）]的值.求1+2cos²θ-cos2 sin5/6π等于多少?