csc(x)=1/sin(x) , csc((pi )/(2))=1, 我上学时好像没学过这

来源: 于 2023-10-17 19:36:22 [旧帖] [给我悄悄话] 本文已被阅读：次

csc(x)*sin(x) =1

csc((\pi )/(2))=1,

csc((\pi )/(2)+\pi )=-1

csc((\pi )/(2)+2*\pi )=1