## Devil's curve
Devil on Two Sticks, a curve with the
Cartesian equationy^{4} - a^{2}y^{2}
= x^{4} - b^{2}x^{2}
and the polar equation r^{ 2}(sin^{2}θ - cos^{2}θ)
= a^{2}sin^{2}θ - b^{2}cos^{2}θ.
Early studies of it were carried out in 1750 by the Swiss mathematician Gabriel Cramer (1704–1752), who is most famous for his work on determinants, and in 1810 by Lacroix. For a = 25/24, the curve is called the
## Related category• PLANE CURVES | |||||||

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