Cassinian oval ( x 2 + y 2 ) 2 − 2 b 2 ( x 2 − y 2 ) − ( a 4 − b 4 ) = 0 , a = 1 {\displaystyle (x^{2}+y^{2})^{2}-2b^{2}(x^{2}-y^{2})-(a^{4}-b^{4})=0...
