Pyramid 121
Preview $$U_{121}(x, y) = \frac{1 - \sqrt{- 4 y \sqrt{4 x + 1} + 1}}{2 y}$$
Pyramid 122
Preview $$U_{122}(x, y) = \frac{1}{\sqrt{1 - 4 x} \sqrt{1 - 4 y}}$$
Pyramid 123
Preview $$U_{123}(x, y) = - \frac{2 x}{x y - x + \sqrt{x^{2} y^{2} + x^{2} - 2 x + y \left(- 2 x^{2} - 2 x\right) + 1} - 1}$$
Pyramid 124
Preview $$U_{124}(x, y) = \frac{x - \sqrt{x^{2} - 2 x + y \left(4 x - 4\right) + 1} - 1}{2 x - 2}$$
Pyramid 125
Preview $$U_{125}(x, y) = y + \sqrt{4 x y + 1}$$
Pyramid 126
Preview $$U_{126}(x, y) = \frac{2 x y + \sqrt{y^{2} \left(4 x^{2} + 1\right) - 2 y + 1}}{\left(1 - y\right)^{2}}$$
Pyramid 127
Preview $$U_{127}(x, y) = y \left(2 x + 1\right) + \sqrt{y^{2} \left(4 x^{2} + 4 x\right) + 1}$$
Pyramid 128
Preview $$U_{128}(x, y) = \frac{1}{\sqrt{x^{2} y^{2} - 4 x^{2} y - 2 x y + 1}}$$
Pyramid 129
Preview $$U_{129}(x, y) = \frac{1}{\sqrt{x^{2} y^{2} - 2 x^{2} y + x^{2} - 2 x y - 2 x + 1}}$$
Pyramid 130
Preview $$U_{130}(x, y) = \frac{1}{- 4 y + \left(- x + y + 1\right)^{2}}$$
Pyramid 131
Preview $$U_{131}(x, y) = \frac{- 2 x y - 2 x - \sqrt{1 - 4 x} \sqrt{- 4 x y + 1} + 1}{2 x^{2} \left(1 - y\right)^{2}}$$
Pyramid 132
Preview $$U_{132}(x, y) = \frac{- \sqrt{1 - 4 x} + \sqrt{- 4 x y + 1}}{- 2 x y + 2 x}$$
Pyramid 133
Preview $$U_{133}(x, y) = \left(x + y\right)^{2}$$
Pyramid 134
Preview $$U_{134}(x, y) = \left(x + y\right)^{3}$$
Pyramid 135
Preview $$U_{135}(x, y) = \left(x + y\right)^{4}$$
Pyramid 136
Preview $$U_{136}(x, y) = \frac{2 x + y - \sqrt{4 x + y^{2} + y \left(4 x + 2\right) + 1} + 1}{2 x^{2}}$$
Pyramid 137
Preview $$U_{137}(x, y) = \frac{- 2 x + \sqrt{4 x + 4 y + 1} - 1}{- 2 x^{2} + 2 y}$$
Pyramid 138
Preview $$U_{138}(x, y) = \frac{2 x + \sqrt{- 4 x - 4 y + 1} - 1}{- 2 x^{2} - 2 y}$$
Pyramid 139
Preview $$U_{139}(x, y) = \frac{- 2 x - y - \sqrt{- 4 x + y^{2} - y \left(2 - 4 x\right) + 1} + 1}{2 x^{2}}$$
Pyramid 140
Preview $$U_{140}(x, y) = \frac{- y + \sqrt{4 x + y^{2} + y \left(4 x + 2\right) + 1} - 1}{2 x y + 2 x}$$
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