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θの範囲が0～2πのとき2θ+π/3は図の斜め線スタートして2周の範囲です。
π/3スタートでcosが√3/2となるのは1周目の黄点11π/6
1周目の緑点13π/6
2周目の黄点23π/6
2周目の緑点25π/6である。
2θ+π/3=11π/6,13π/6,23π/6,25π/6
2θ=3π/2,11π/6,7π/2,23π/6
θ=3π/4,11π/12,7π/4,23π/12
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