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(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)

来源：学生作业帮 编辑：灵鹊做题网作业帮 分类：数学作业 时间：2024/05/02 00:54:30
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
=[sin(π/2-π/12)+cos(π/2-π/12)](sinπ/12-cosπ/12)
=(cosπ/12+sinπ/12)(sinπ/12-cosπ/12)
=sin²π/12-cos²π/12
=-(cos²π/12-sin²π/12)
=-cosπ/6
=-√3/2
(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