Pyramid 61
Preview $$U_{61}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{2} - 8 x - 4\right) + 1}}{2 y}$$
Pyramid 62
Preview $$U_{62}(x, y) = \frac{\left(1 - \sqrt{1 - 4 x}\right) \left(y + 1\right)}{2 x}$$
Pyramid 63
Preview $$U_{63}(x, y) = \frac{1 - \sqrt{1 - 4 x}}{2 x + y \left(\sqrt{1 - 4 x} - 1\right)}$$
Pyramid 64
Preview $$U_{64}(x, y) = \frac{- x + \sqrt{x^{2} + 2 y \sqrt{1 - 4 x} + y \left(4 x - 2\right)}}{y \left(\sqrt{1 - 4 x} - 1\right)}$$
Pyramid 65
Preview $$U_{65}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right) \left(x + 1\right)}{2 y}$$
Pyramid 66
Preview $$U_{66}(x, y) = \frac{1 - \sqrt{1 - 4 y}}{x \sqrt{1 - 4 y} - x + 2 y}$$
Pyramid 67
Preview $$U_{67}(x, y) = \frac{- y + \sqrt{4 x y + 2 x \sqrt{1 - 4 y} - 2 x + y^{2}}}{x \left(\sqrt{1 - 4 y} - 1\right)}$$
Pyramid 68
Preview $$U_{68}(x, y) = \frac{1 - \sqrt{1 - 4 x}}{2 x \left(1 - y\right)}$$
Pyramid 69
Preview $$U_{69}(x, y) = \frac{x - \sqrt{x^{2} + 2 x y \sqrt{1 - 4 x} - 2 x y}}{2 x y}$$
Pyramid 70
Preview $$U_{70}(x, y) = \frac{1}{- x + \left(1 - y\right)^{2}}$$
Pyramid 71
Preview $$U_{71}(x, y) = \frac{y^{2} - 2 y - \sqrt{- 4 x + y^{4} - 4 y^{3} + 6 y^{2} - 4 y + 1} + 1}{2 x}$$
Pyramid 72
Preview $$U_{72}(x, y) = \frac{x + 1}{\left(1 - y\right)^{2}}$$
Pyramid 73
Preview $$U_{73}(x, y) = \frac{\sqrt{4 x y^{2} - 8 x y + 4 x + 1} + 1}{2 y^{2} - 4 y + 2}$$
Pyramid 74
Preview $$U_{74}(x, y) = \frac{y + 1}{\left(1 - x\right)^{2}}$$
Pyramid 75
Preview $$U_{75}(x, y) = \frac{\sqrt{y \left(4 x^{2} - 8 x + 4\right) + 1} + 1}{2 x^{2} - 4 x + 2}$$
Pyramid 76
Preview $$U_{76}(x, y) = \frac{1}{- y + \left(1 - x\right)^{2}}$$
Pyramid 77
Preview $$U_{77}(x, y) = \frac{x^{2} - 2 x - \sqrt{x^{4} - 4 x^{3} + 6 x^{2} - 4 x - 4 y + 1} + 1}{2 y}$$
Pyramid 78
Preview $$U_{78}(x, y) = \left(x + 1\right)^{2} \left(y + 1\right)$$
Pyramid 79
Preview $$U_{79}(x, y) = \frac{x^{2}}{2} + x + \frac{\left(x + 1\right) \sqrt{x^{2} + 2 x + 4 y + 1}}{2} + \frac{1}{2}$$
Pyramid 80
Preview $$U_{80}(x, y) = \frac{- x^{2} - 2 x - 1}{y \left(x^{2} + 2 x + 1\right) - 1}$$
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