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cos2θ=cos2乗θ－sin2乗θ…1
1=sin２乗θ+cos２乗θ…２
1-2=0
sin２θ=2sinθcosθなので
与式 → 2sinθcosθ＞0
90<θ<180,270<θ<360を除く範囲では満たす
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