ContourPlot[ E^(k t) (k Cos[t] - Sin[t]) + Sin[t] == 0, {k, 0, 10}, {t, 0, 2 Pi}]ContourPlot[ E^(k t) (k Cos[t] - Sin[t]) + Sin[t] == 0, {k, 0, 10}, {t, 0, 2 Pi}]

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