sin5π/8=cosπ/8?
计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
sin5/12π*cosπ/12 怎么算
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
数学极限的运算lim α→π/2 (sinα-sin5α)/(cosα+cos5α)
(sin5π12−sinπ12)(sin5π12+sinπ12)
sinπ18sin5π18sin(-65π18)=( )
已知角α终边上一点坐标为(sin5π/6,cos5π/6)求sinα和cosα的值
cos(π/32)*cos(π/16)*cos(π/8)=
sinπ /14*sin3π /14*sin5π /14
sin5/12π×cos5/12π怎么算?
81.1 ,设a=sin5π/7,b=cos2π/7,c=tan2π/7,则