Mathematics
Senior High

答えは 0≦θ<1/6π, 5/3π<θ<2πです。
求め方が分かりません教えてください🙇🏻

(2) 0<=9<2zの範囲で不等式 in[す-和< ー1 を解くと 0ミの< の 7くりのご2ァ 3コ ッ 時 となる.
三角関数 加法定理

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