ANS:
tan(arg z) = -12/5 ------------- 1
arg z = 1.97 ----------- 2
z = 13(cos 1.97 + i sin 1.97)
我想知 1 點變 2
明明 tan^(-1) [-12/5] = - 67. XXX
點解會係 1.97 ??
更新1:
係咪一定要用argand圖諗? 點解唔可以係 -67.3801 + 360 = 282.6198?
係咪一定要用argand圖諗? 點解唔可以係 -67.3801 + 360 = 282.6198?
收錄日期: 2021-04-26 13:05:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090207000051KK00835