Pyramid 901
Preview $$U_{901}(x, y) = \frac{1}{\left(1 - y\right)^{3} \left(- x \left(1 - y\right) + 1\right)^{2}}$$
Pyramid 902
Preview $$U_{902}(x, y) = x \left(1 - y\right) + \frac{\sqrt{4 x + \frac{1}{\left(1 - y\right)^{4}}}}{2 \left(1 - y\right)} + \frac{1}{2 \left(1 - y\right)^{3}}$$
Pyramid 903
Preview $$U_{903}(x, y) = \frac{\sqrt{- 4 x y^{2} - 8 x y - 4 x + 1} + 1}{2 y + 2}$$
Pyramid 904
Preview $$U_{904}(x, y) = \left(x + 1\right) \left(y + 2\right)$$
Pyramid 905
Preview $$U_{905}(x, y) = \frac{- y - 2}{x y + 2 x - 1}$$
Pyramid 906
Preview $$U_{906}(x, y) = \frac{1 - \sqrt{- 4 x y^{2} - 16 x y - 16 x + 1}}{2 x y + 4 x}$$
Pyramid 907
Preview $$U_{907}(x, y) = \frac{\sqrt{- 4 x y^{2} - 16 x y - 16 x + 1} + 1}{2 y + 4}$$
Pyramid 908
Preview $$U_{908}(x, y) = \frac{- 2 x - y - \sqrt{4 x^{2} - 4 x + y^{2} + y \left(- 4 x - 2\right) + 1} + 1}{4 x y}$$
Pyramid 909
Preview $$U_{909}(x, y) = - x - \frac{y}{2} + \frac{\sqrt{4 x^{2} - 4 x + y^{2} + y \left(- 4 x - 2\right) + 1}}{2} + \frac{1}{2}$$
Pyramid 910
Preview $$U_{910}(x, y) = \left(x + 1\right) \left(2 y + 1\right)$$
Pyramid 911
Preview $$U_{911}(x, y) = \frac{- 2 y - 1}{2 x y + x - 1}$$
Pyramid 912
Preview $$U_{912}(x, y) = \frac{- x - 1}{y \left(2 x + 2\right) - 1}$$
Pyramid 913
Preview $$U_{913}(x, y) = \frac{1 - \sqrt{y \left(- 8 x^{2} - 16 x - 8\right) + 1}}{y \left(4 x + 4\right)}$$
Pyramid 914
Preview $$U_{914}(x, y) = \frac{x}{2} + \frac{\sqrt{x^{2} + 2 x + y \left(8 x + 8\right) + 1}}{2} + \frac{1}{2}$$
Pyramid 915
Preview $$U_{915}(x, y) = \frac{x}{2} - \frac{\sqrt{x^{2} + 2 x + y \left(8 x + 8\right) + 1}}{2} + \frac{1}{2}$$
Pyramid 916
Preview $$U_{916}(x, y) = \frac{x}{3} + \frac{x^{2} + 2 x + 1}{9 \sqrt[3]{\frac{x^{3}}{27} + \frac{x^{2}}{9} + \frac{x \left(27 y + 3\right)}{27} + y + \frac{\sqrt{3} \sqrt{y \left(2 x^{2} + 4 x + 27 y + 2\right)} \left(x + 1\right)}{9} + \frac{1}{27}}} + \sqrt[3]{\frac{x^{3}}{27} + \frac{x^{2}}{9} + \frac{x \left(27 y + 3\right)}{27} + y + \frac{\sqrt{3} \sqrt{y \left(2 x^{2} + 4 x + 27 y + 2\right)} \left(x + 1\right)}{9} + \frac{1}{27}} + \frac{1}{3}$$
Pyramid 917
Preview $$U_{917}(x, y) = \frac{x + 1}{1 - 2 y}$$
Pyramid 918
Preview $$U_{918}(x, y) = - \frac{1}{x + 2 y - 1}$$
Pyramid 919
Preview $$U_{919}(x, y) = \frac{1 - \sqrt{y \left(- 8 x - 8\right) + 1}}{4 y}$$
Pyramid 920
Preview $$U_{920}(x, y) = \frac{\sqrt{y \left(- 8 x - 8\right) + 1}}{4} + \frac{1}{4}$$
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