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| I have this equation : w[s_, u_] := 1 + (1 + 0.65 s - 1.2 s^2 - 0.4 s^3 + 0.35 s^4) Cos[u] + (1.4 s - 0.4 s^2 - 1.5 s^3 - 0.35 s^4) Sin[u]; And I need to find the critical point of this equation; The requirement is using the ContourPlot... |