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Plot[{Sin[θ], Sin[θ/3], Sin[θ/3 - Pi/6]}, {θ, -(13/3) Pi, (13/3) Pi}]
Plot[{Sin[θ], Sin[θ/3], Sin[θ/3 - Pi/6]}, {θ, -(13/3) Pi, (13/3) Pi}]
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