计算:sinπ/12 sin5π/12
(sin5π12−sinπ12)(sin5π12+sinπ12)
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
sinπ /14*sin3π /14*sin5π /14
计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
sin5/12π×cos5/12π怎么算?
sin5/12π*cosπ/12 怎么算
sinπ18sin5π18sin(-65π18)=( )
计算:sinπ12
数学极限的运算lim α→π/2 (sinα-sin5α)/(cosα+cos5α)
计算cosπ/12*sinπ/12
求5π/3的正弦、余弦、正切值、求详解,百度上有些答案是sin5π/3=sinπ/3这一步怎么来