Pyramid 801
Preview $$U_{801}(x, y) = \frac{1}{\left(- \frac{x}{1 - y} + 1\right)^{2}}$$
Pyramid 802
Preview $$U_{802}(x, y) = \frac{- 2 x + y - \sqrt{4 x + y^{2} + y \left(- 4 x - 2\right) + 1} - 1}{2 y - 2}$$
Pyramid 803
Preview $$U_{803}(x, y) = \frac{- 2 x \left(y + 1\right)^{2} - \sqrt{- 4 x \left(y + 1\right)^{2} + 1} + 1}{2 x^{2} \left(y + 1\right)^{2}}$$
Pyramid 804
Preview $$U_{804}(x, y) = \frac{\left(1 - y\right)^{2} \left(- \frac{2 x}{1 - y} - \sqrt{- \frac{4 x}{1 - y} + 1} + 1\right)}{2 x^{2}}$$
Pyramid 805
Preview $$U_{805}(x, y) = \frac{\left(1 - y\right)^{4} \left(- \frac{2 x}{\left(1 - y\right)^{2}} - \sqrt{- \frac{4 x}{\left(1 - y\right)^{2}} + 1} + 1\right)}{2 x^{2}}$$
Pyramid 806
Preview $$U_{806}(x, y) = \frac{1}{\left(- \frac{x \left(1 - \sqrt{1 - 4 y}\right)}{2 y} + 1\right)^{2}}$$
Pyramid 807
Preview $$U_{807}(x, y) = \frac{y^{2} \left(- \frac{2 x \left(1 - \sqrt{1 - 4 y}\right)}{y} - 2 \sqrt{- \frac{2 x \left(1 - \sqrt{1 - 4 y}\right)}{y} + 1} + 2\right)}{x^{2} \left(1 - \sqrt{1 - 4 y}\right)^{2}}$$
Pyramid 808
Preview $$U_{808}(x, y) = \left(x + y\right) \left(y + 1\right)^{2}$$
Pyramid 809
Preview $$U_{809}(x, y) = \frac{x + y}{\left(1 - y\right)^{2}}$$
Pyramid 810
Preview $$U_{810}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right) \left(x + y\right)}{2 y}$$
Pyramid 811
Preview $$U_{811}(x, y) = \frac{\left(x + y\right) \left(- 2 y - \sqrt{1 - 4 y} + 1\right)}{2 y^{2}}$$
Pyramid 812
Preview $$U_{812}(x, y) = \frac{2 \sqrt{3} \left(x + y\right) \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x}}{2} \right)}}{3} \right)}}{3 \sqrt{x}}$$
Pyramid 813
Preview $$U_{813}(x, y) = \frac{2 \sqrt{3} \left(1 - y\right) \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x}}{2 - 2 y} \right)}}{3} \right)}}{3 \sqrt{x}}$$
Pyramid 814
Preview $$U_{814}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x} \left(y + 1\right)}{2} \right)}}{3} \right)}}{3 \sqrt{x} \left(y + 1\right)}$$
Pyramid 815
Preview $$U_{815}(x, y) = \left(\frac{x}{\sqrt{1 - 4 y}} + 1\right)^{2}$$
Pyramid 816
Preview $$U_{816}(x, y) = \frac{- 2 x \sqrt{1 - 4 y} - 4 y - \sqrt{16 y^{2} - 8 y + \sqrt{1 - 4 y} \left(16 x y - 4 x\right) + 1} + 1}{2 x^{2}}$$
Pyramid 817
Preview $$U_{817}(x, y) = \frac{1}{\left(- \frac{x}{\sqrt{1 - 4 y}} + 1\right)^{2}}$$
Pyramid 818
Preview $$U_{818}(x, y) = \frac{1}{\sqrt{- \frac{4 x}{\sqrt{1 - 4 y}} + 1}}$$
Pyramid 819
Preview $$U_{819}(x, y) = \frac{1}{- x \sqrt{4 y + 1} + 1}$$
Pyramid 820
Preview $$U_{820}(x, y) = \frac{1 - \sqrt{- 4 x y^{5} - 20 x y^{4} - 40 x y^{3} - 40 x y^{2} - 20 x y - 4 x + 1}}{2 x y^{2} + 4 x y + 2 x}$$
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