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（3）（4）の解き方をくわしく教えてください🙇♀️
7 [3ROUND 数学Ⅱ 問題249]
0≤02 のとき,次の方程式を解け。
(1) sin 20√√√3 sin 0 =0
(3) cos 20 = cos 0-1
(2) sin 20+ cos 0 = 0
(4) cos 20 = sin 0
(1) Sin 20-√3 Sin 0 = 0
2sing Cost - √sin 0=0
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