Pyramid 161
Preview $$U_{161}(x, y) = \frac{x - \sqrt{x^{2} - 2 x + 4 y + 1} - 1}{2 x - 2}$$
Pyramid 162
Preview $$U_{162}(x, y) = \frac{y}{\left(1 - x\right)^{3}} + 1$$
Pyramid 163
Preview $$U_{163}(x, y) = \frac{\left(1 - x\right)^{3}}{- y + \left(1 - x\right)^{3}}$$
Pyramid 164
Preview $$U_{164}(x, y) = \frac{- x^{3} + 3 x^{2} - 3 x + \left(x - 1\right) \sqrt{x^{4} - 4 x^{3} + 6 x^{2} - 4 x + y \left(4 x - 4\right) + 1} + 1}{2 y}$$
Pyramid 165
Preview $$U_{165}(x, y) = \frac{x^{2} - 2 x + \sqrt{x^{4} - 4 x^{3} + 6 x^{2} - 4 x + y \left(4 - 4 x\right) + 1} + 1}{2 x^{2} - 4 x + 2}$$
Pyramid 166
Preview $$U_{166}(x, y) = \left(x + 1\right) \left(y \left(x + 1\right) + 1\right)$$
Pyramid 167
Preview $$U_{167}(x, y) = \frac{- x - 1}{y \left(x^{2} + 2 x + 1\right) - 1}$$
Pyramid 168
Preview $$U_{168}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{3} - 12 x^{2} - 12 x - 4\right) + 1}}{2 y \left(x + 1\right)^{2}}$$
Pyramid 169
Preview $$U_{169}(x, y) = \frac{x}{2} + \frac{\left(x + 1\right) \sqrt{4 y + 1}}{2} + \frac{1}{2}$$
Pyramid 170
Preview $$U_{170}(x, y) = \frac{- 2 x y - x - \sqrt{x^{2} - 4 x y - 2 x + 1} + 1}{2 x^{2} y}$$
Pyramid 171
Preview $$U_{171}(x, y) = \frac{1}{x^{2} - 2 x + y \left(x - 1\right) + 1}$$
Pyramid 172
Preview $$U_{172}(x, y) = \frac{- x^{2} + 2 x + \sqrt{x^{4} - 4 x^{3} + 6 x^{2} - 4 x + y \left(4 x - 4\right) + 1} - 1}{y \left(2 x - 2\right)}$$
Pyramid 173
Preview $$U_{173}(x, y) = \frac{- y \left(x - 1\right) + 1}{\left(1 - x\right)^{2}}$$
Pyramid 174
Preview $$U_{174}(x, y) = \left(x + 1\right) \left(y \left(x + 1\right)^{2} + 1\right)$$
Pyramid 175
Preview $$U_{175}(x, y) = \frac{- x - 1}{y \left(x^{3} + 3 x^{2} + 3 x + 1\right) - 1}$$
Pyramid 176
Preview $$U_{176}(x, y) = \frac{1 - \sqrt{- 4 y \left(x + 1\right)^{4} + 1}}{2 y \left(x + 1\right)^{3}}$$
Pyramid 177
Preview $$U_{177}(x, y) = \frac{x}{2} + \frac{\left(x + 1\right) \sqrt{y \left(4 x + 4\right) + 1}}{2} + \frac{1}{2}$$
Pyramid 178
Preview $$U_{178}(x, y) = x + \frac{y}{2} + \frac{\sqrt{4 x + y^{2} + 2 y + 1}}{2} + \frac{1}{2}$$
Pyramid 179
Preview $$U_{179}(x, y) = \frac{x y - 2 x - \sqrt{x^{2} y^{2} - 2 x y + 4 x + 1} - 1}{2 y - 2}$$
Pyramid 180
Preview $$U_{180}(x, y) = \frac{1}{- x^{2} - 2 x + y \left(x + 1\right) - 1}$$
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