parametric plot (cos t, ((2 - 2*(cos t)^2)*(4/10)^2 + (2*(cos t)^2 - 4)*(4/10)+ 1)sin t)parametric plot (cos t, ((2 - 2*(cos t)^2)*(4/10)^2 + (2*(cos t)^2 - 4)*(4/10)+ 1)sin t)

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