Equation of Ovals of Cassini/Cartesian Form/Also presented as

Equation of Ovals of Cassini: Cartesian Form: Also presented as

Some sources present the equation defining the ovals of Cassini as:

$\paren {\paren {x^2 + a^2} + y^2} \paren {\paren {x^2 - a^2} + y^2} = b^4$

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): Cassini's ovals
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Cassini's ovals

• Weisstein, Eric W. "Cassini Ovals." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CassiniOvals.html