Mathematics
Senior High
どっちからどっちを引けばいいのか分かりません
117* 次の複素数 z1, Z2 が表す点をそれぞれP, Qとする。このとき,
半直線 PQ が実軸の正の向きとなす角を求めよ。
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(1) 21 =2-2i, 22 =1-3i
(2) 2 =5-/3i, 22 = 3+V3i
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