赞 charlsezhang 幼苗
共回答了16个问题采纳率：75% 举报
sin(π/24)sin(11π24)sin(7π/12)
=0.5*(cos(11π24-π/24)-cos(11π/24+π/24))sin(7π/24)
=0.5(cos(5π/12)sin(7π/12))
=0.25(sin(π)+sin(π/6))
=0.25*0.5
0.125
=0.5*(cos(11π24-π/24)-cos(11π/24+π/24))sin(7π/24)
=0.5(cos(5π/12)sin(7π/12))
=0.25(sin(π)+sin(π/6))
=0.25*0.5
0.125
1年前
5
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