作业帮sin5/12π*cosπ/12 怎么算
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sin5/12π*cosπ/12 怎么算
sin5/12π*cosπ/12 怎么算
sin5/12π*cosπ/12 怎么算
sin（1/4π + 1/6π）×cos（1/4π -1/6π）然后用正弦余弦的和角差角公式算就行了
sin5/12π=sin(π/4+π/6)=sinπ/4cosπ/6+cosπ/4sinπ/6=√2/2 (√3/2+1/2)
cosπ/12=sin(π/2-π/12)=sin5π/12=√2/2 (√3/2+1/2)
sin5/12π*cosπ/12 =[√2/2 (√3/2+1/2)]^2=1/2+√3/4
sin5/12π*cosπ/12 怎么算
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
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