Con WolframAlpha
astroidfish

parametric plot ( cos(t)^3, sin(t)^3 ), parametric plot (cos(t)*1.3, sin(t)*1.3 )
parametric plot ( cos(t)-(sin(t)^2)/sqrt(2)), sin(t)*cos(t) ), parametric plot (cos(t)*1.3, sin(t)*1.3 )



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