例1求下列各式的值: (1)Ln(-2+3i);(2)Ln(3-√3i);(3)Ln(-3). 解()Ln(-2+3i) =ln-2+3i+iArg(-2+3i) t3arctanj rk) (k=0,±1,±2,) 99 例 1 (1)Ln( 2 3 ); (2)Ln(3 3 ); (3)Ln( 3). : − + i − i − 求下列各式的值 解 (1)Ln ( − 2 + 3 i ) = ln − 2 + 3i + iArg(−2 + 3i)2 . 23 ln13 arctan 21 = + i − + k (k = 0, 1, 2,)