复数-cos1π/7+isin1π/7的共轧复数的辐角主值是
问题描述:
复数-cos1π/7+isin1π/7的共轧复数的辐角主值是
答
共轧复数是-cosπ/7-isinπ/7
=cos(π+π/7)+isin(π+π/7)
所以是π+π/7=8π/7