Mathematics
Senior High
急ぎです！！三角関数です。(3)の問題の解き方を教えて頂きたいです。宜しくお願いします。
27900<2πのとき, 次の方程式, 不等式を解け
(1) cos (20) = 1/
*(2) sin
2
*(3)
cos(20+)<-
√3
2
tan
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