Pyramid 661
Preview $$U_{661}(x, y) = \frac{x}{1 - 4 y} + \frac{1}{\sqrt{1 - 4 y}}$$
Pyramid 662
Preview $$U_{662}(x, y) = - \frac{1}{\sqrt{1 - 4 y} \left(\frac{x}{1 - 4 y} - 1\right)}$$
Pyramid 663
Preview $$U_{663}(x, y) = \frac{\left(1 - 4 y\right) \left(1 - \sqrt{- \frac{4 x}{\left(1 - 4 y\right)^{\frac{3}{2}}} + 1}\right)}{2 x}$$
Pyramid 664
Preview $$U_{664}(x, y) = \frac{\sqrt{4 x \left(y + 1\right) + 1}}{2} + \frac{1}{2}$$
Pyramid 665
Preview $$U_{665}(x, y) = \frac{1 - \sqrt{4 x \left(y + 1\right) + 1}}{2 x}$$
Pyramid 666
Preview $$U_{666}(x, y) = \frac{\sqrt{4 x \left(y + 1\right)^{2} + 1} - 1}{2 x}$$
Pyramid 667
Preview $$U_{667}(x, y) = \frac{y^{2} + 2 y + 1}{x + 1}$$
Pyramid 668
Preview $$U_{668}(x, y) = \frac{x}{1 - y} + 1$$
Pyramid 669
Preview $$U_{669}(x, y) = \frac{\sqrt{\frac{4 x}{1 - y} + 1}}{2} + \frac{1}{2}$$
Pyramid 670
Preview $$U_{670}(x, y) = \frac{- 2 x - \sqrt{1 - 4 x} + 1}{2 x^{2} \sqrt{1 - 4 y}}$$
Pyramid 671
Preview $$U_{671}(x, y) = \sqrt{1 - 4 y} \left(x^{2} + \frac{2 x}{\sqrt{1 - 4 y}} + \frac{1}{1 - 4 y}\right)$$
Pyramid 672
Preview $$U_{672}(x, y) = \frac{\sqrt{\frac{4 x}{1 - y} + 1} - 1}{2 x}$$
Pyramid 673
Preview $$U_{673}(x, y) = \frac{x}{\left(1 - y\right)^{2}} + 1$$
Pyramid 674
Preview $$U_{674}(x, y) = \frac{\sqrt{\frac{4 x}{\left(1 - y\right)^{2}} + 1}}{2} + \frac{1}{2}$$
Pyramid 675
Preview $$U_{675}(x, y) = \frac{\sqrt{\frac{4 x}{\left(1 - y\right)^{2}} + 1} - 1}{2 x}$$
Pyramid 676
Preview $$U_{676}(x, y) = \frac{1}{\left(1 - y\right)^{2} \left(x + 1\right)}$$
Pyramid 677
Preview $$U_{677}(x, y) = \frac{x \left(1 - \sqrt{1 - 4 y}\right)}{2 y} + 1$$
Pyramid 678
Preview $$U_{678}(x, y) = \frac{\sqrt{\frac{2 x \left(1 - \sqrt{1 - 4 y}\right)}{y} + 1}}{2} + \frac{1}{2}$$
Pyramid 679
Preview $$U_{679}(x, y) = \frac{1 - \sqrt{\frac{2 x \left(1 - \sqrt{1 - 4 y}\right)}{y} + 1}}{2 x}$$
Pyramid 680
Preview $$U_{680}(x, y) = \frac{x}{\sqrt{1 - 4 y}} + 1$$
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