Mathematics
Senior High

どうしてcos α/2<0になるか分かりません……

(2) cos2= 3 <7 < 1 / + したがって 1- 11/01/1 1+ cos a 5 — a COS cos= 13 2 2 であるから.com/ COS 2 V/E 4 13 √13 <0
半角 cos

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