隔世红颜008
幼苗
共回答了20个问题采纳率：90% 举报
sin180/16*cos180/16*cos180/8*cos180/4 =1/2*(2sin180/16*cos180/16)*cos180/8*cos180/4 =1/2*sin180/8*cos180/8*cos180/4 =1/2*1/2*(2sin180/8*cos180/8)*cos180/4 =1/4*sin180/4*cos180/4 =1/4*1/2*(2sin180/4*cos180/4) =1/8sin180/2 =1/8*sin90 =1/8
1年前
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