(cos79度+isin79度)除(cos19度+isin19度)=
问题描述:
(cos79度+isin79度)除(cos19度+isin19度)=
答
(cos79度+isin79度)除(cos19度+isin19度)
=(cos79度+isin79度)除(sin79度+icos79度)
=(cos79度+isin79度)*(sin79度-icos79度)除[(sin79度+icos79度)(sin79度-icos79度)]
=sin158-icos158
你能明白,赞同