csc[arccos(3960/3961)],如何回答
求(3960/3961)的反余弦,再余割值
解:设arccos(3960/3961)=α
∴cosα=3960/3961
∴ sinα
=√﹙1-cos²α﹚
=√[1-﹙3960/3961﹚²]
=√[﹙1+3960/3961﹚×﹙1-3960/3961﹚]
=√[7921/3961×1/3961]
=√﹙89²/3961²﹚
=89/3961
cscα
=1/sinα
=1/﹙89/3961﹚
=3961/89
≈44.5056
∴csc[arccos(3960/3961)]=3961/89
≈44.5056
下一篇:恶业未成熟,愚人思如蜜;恶业成熟时,愚人必受苦。什么意思
上一篇:见习校长什么意思
热门标签: