(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
sin5/12π×cos5/12π怎么算?
(sin5π12−sinπ12)(sin5π12+sinπ12)
cos5π/12=sinπ/12
cos5/12πcosπ/12+cosπ/12sinπ/6=?
数学极限的运算lim α→π/2 (sinα-sin5α)/(cosα+cos5α)
sin5/12π*cosπ/12 怎么算
不查表求值:cos5π/12·sinπ/12=
为什么cos5π/12等于sinπ/12
已知角α终边上一点坐标为(sin5π/6,cos5π/6)求sinα和cosα的值
求值cos5π/8*cosπ8