Pyramid 841
Preview $$U_{841}(x, y) = \frac{\left(1 - \sqrt{- 4 x \left(y + 1\right) + 1}\right) \left(y + 1\right)^{2}}{2 x}$$
Pyramid 842
Preview $$U_{842}(x, y) = \frac{\left(1 - \sqrt{- 4 x \left(y + 1\right)^{2} + 1}\right) \left(y + 1\right)}{2 x}$$
Pyramid 843
Preview $$U_{843}(x, y) = \frac{\left(1 - \sqrt{- 4 x \left(y + 1\right)^{2} + 1}\right) \left(y + 1\right)^{2}}{2 x}$$
Pyramid 844
Preview $$U_{844}(x, y) = \frac{1 - \sqrt{- \frac{4 x}{1 - y} + 1}}{2 x \left(1 - y\right)}$$
Pyramid 845
Preview $$U_{845}(x, y) = \frac{1}{x y^{3} - x + y^{2} \left(1 - 3 x\right) + y \left(3 x - 2\right) + 1}$$
Pyramid 846
Preview $$U_{846}(x, y) = \frac{1 - \sqrt{- \frac{4 x}{1 - y} + 1}}{2 x \left(1 - y\right)^{2}}$$
Pyramid 847
Preview $$U_{847}(x, y) = \frac{1}{x y^{5} - 5 x y^{4} - x + y^{3} \left(10 x - 1\right) + y^{2} \left(3 - 10 x\right) + y \left(5 x - 3\right) + 1}$$
Pyramid 848
Preview $$U_{848}(x, y) = \frac{1 - \sqrt{- \frac{4 x}{1 - y} + 1}}{2 x \left(1 - y\right)^{3}}$$
Pyramid 849
Preview $$U_{849}(x, y) = \frac{1}{x y^{7} - 7 x y^{6} + 21 x y^{5} - x + y^{4} \left(1 - 35 x\right) + y^{3} \left(35 x - 4\right) + y^{2} \left(6 - 21 x\right) + y \left(7 x - 4\right) + 1}$$
Pyramid 850
Preview $$U_{850}(x, y) = \frac{1}{\left(1 - y\right) \left(- \frac{x}{1 - y} + 1\right)^{2}}$$
Pyramid 851
Preview $$U_{851}(x, y) = \frac{- 2 x - \sqrt{4 x + 1} - 1}{2 y - 2}$$
Pyramid 852
Preview $$U_{852}(x, y) = \frac{- 2 x y + 2 x + \sqrt{- 4 x y + 4 x + 1} + 1}{2 y^{2} - 4 y + 2}$$
Pyramid 853
Preview $$U_{853}(x, y) = \frac{1}{\left(1 - y\right)^{3} \left(- \frac{x}{1 - y} + 1\right)^{2}}$$
Pyramid 854
Preview $$U_{854}(x, y) = \frac{- 2 x y^{2} + 4 x y - 2 x - \sqrt{4 x y^{2} - 8 x y + 4 x + 1} - 1}{2 y^{3} - 6 y^{2} + 6 y - 2}$$
Pyramid 855
Preview $$U_{855}(x, y) = \frac{\sqrt{3} \left(2 y + 2\right) \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x \left(y + 1\right)}}{2} \right)}}{3} \right)}}{3 \sqrt{x \left(y + 1\right)}}$$
Pyramid 856
Preview $$U_{856}(x, y) = \frac{\left(1 - \sqrt{- \frac{4 x}{y + 1} + 1}\right) \left(y + 1\right)^{3}}{2 x}$$
Pyramid 857
Preview $$U_{857}(x, y) = \frac{\left(y + 1\right)^{5}}{- x + \left(y + 1\right)^{3}}$$
Pyramid 858
Preview $$U_{858}(x, y) = \frac{x + \left(y + 1\right)^{5}}{\left(y + 1\right)^{3}}$$
Pyramid 859
Preview $$U_{859}(x, y) = \frac{2 \sqrt{3} \left(y + 1\right)^{2} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x \left(y + 1\right)}}{2} \right)}}{3} \right)}}{3 \sqrt{x \left(y + 1\right)}}$$
Pyramid 860
Preview $$U_{860}(x, y) = \frac{2 \sqrt{3} \left(y + 1\right)^{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x \left(y + 1\right)}}{2} \right)}}{3} \right)}}{3 \sqrt{x \left(y + 1\right)}}$$
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