ContourPlot[ Sin[x] Cos[5 x] == Sin[a x] Cos[3 x], {a, -2 Pi, 2 Pi}, {x, 0, 10}]ContourPlot[ Sin[x] Cos[5 x] == Sin[a x] Cos[3 x], {a, -2 Pi, 2 Pi}, {x, 0, 10}]

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