Pyramid 21
Preview $$U_{21}(x, y) = \frac{- x - \sqrt{x^{2} - 2 x - 4 y + 1} + 1}{2 y}$$
Pyramid 22
Preview $$U_{22}(x, y) = \frac{- y - \sqrt{- 4 x + y^{2} - 2 y + 1} + 1}{2 x}$$
Pyramid 23
Preview $$U_{23}(x, y) = \left(x + 1\right) \left(x y + 1\right)$$
Pyramid 24
Preview $$U_{24}(x, y) = \frac{- x - 1}{y \left(x^{2} + x\right) - 1}$$
Pyramid 25
Preview $$U_{25}(x, y) = \frac{- x y - x - \sqrt{x^{2} y^{2} + x^{2} - 2 x + y \left(- 2 x^{2} - 2 x\right) + 1} + 1}{2 x^{2} y}$$
Pyramid 26
Preview $$U_{26}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{3} - 8 x^{2} - 4 x\right) + 1}}{x y \left(2 x + 2\right)}$$
Pyramid 27
Preview $$U_{27}(x, y) = \frac{- 2 x - 2 y - \sqrt{- 4 x - 4 y + 1} + 1}{2 \left(x + y\right)^{2}}$$
Pyramid 28
Preview $$U_{28}(x, y) = \frac{x + 1}{- x y + 1}$$
Pyramid 29
Preview $$U_{29}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{2} - 4 x\right) + 1}}{2 x y}$$
Pyramid 30
Preview $$U_{30}(x, y) = \frac{- x - \sqrt{x^{2} - 4 x y - 2 x + 1} + 1}{2 x y}$$
Pyramid 31
Preview $$U_{31}(x, y) = \frac{y}{\left(1 - x\right)^{3}} + \frac{1}{1 - x}$$
Pyramid 32
Preview $$U_{32}(x, y) = \frac{\left(1 - x\right)^{2}}{- y + \left(1 - x\right)^{3}}$$
Pyramid 33
Preview $$U_{33}(x, y) = \frac{- x^{3} + 3 x^{2} - 3 x + \left(x - 1\right) \sqrt{x^{4} - 4 x^{3} + 6 x^{2} - 4 x - 4 y + 1} + 1}{2 y}$$
Pyramid 34
Preview $$U_{34}(x, y) = x + y + 1$$
Pyramid 35
Preview $$U_{35}(x, y) = \frac{y + 1}{1 - x}$$
Pyramid 36
Preview $$U_{36}(x, y) = \frac{1 - \sqrt{x \left(- 4 y - 4\right) + 1}}{2 x}$$
Pyramid 37
Preview $$U_{37}(x, y) = x y + x + 1$$
Pyramid 38
Preview $$U_{38}(x, y) = \frac{1}{- x y - x + 1}$$
Pyramid 39
Preview $$U_{39}(x, y) = \frac{1 - \sqrt{- 4 x y - 4 x + 1}}{x \left(2 y + 2\right)}$$
Pyramid 40
Preview $$U_{40}(x, y) = \frac{y}{2} + \frac{\sqrt{4 x + y^{2} + 2 y + 1}}{2} + \frac{1}{2}$$
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