plot x^(2/3) +.9 * (3.3 -x^2)^(1/2) * Sin[-10 π * x] and x^(2/3) +.9 * (3.3 -x^2)^(1/2) * Sin[10 π * x] and x^(2/3) +.9 * (3.3 -x^2)^(1/2) * Sin[ π * x]

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