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Plot[{Sin[ x] + Cos[x], Sin[ x + 0.25*2 Pi] + Cos[x + 0.25*2 Pi]}, {x, 0, 2 Pi}]
Plot[{Sin[ x] + Cos[x], Sin[ x + 0.25*2 Pi] + Cos[x + 0.25*2 Pi]}, {x, 0, 2 Pi}]
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