The Joy of Mathematics

Title: Radial Hyperbolae and Circle
Description: r² = (x² - y² - 1) (y² - x² - 1) (x² + y² - 1)
Equation: z = (x² - y² - 1) (y² - x² - 1) (x² + y² - 1) - r²
Drawing Limits: (-1.1, -1.1) - (1.1, 1.1)
Min z: -1.42419, Max z: -0.851859