Pyramid 861
Preview $$U_{861}(x, y) = \frac{\left(1 - \sqrt{- \frac{4 x}{\left(y + 1\right)^{2}} + 1}\right) \left(y + 1\right)^{5}}{2 x}$$
Pyramid 862
Preview $$U_{862}(x, y) = \frac{\left(y + 1\right)^{8}}{- x + \left(y + 1\right)^{5}}$$
Pyramid 863
Preview $$U_{863}(x, y) = \frac{x + \left(y + 1\right)^{8}}{\left(y + 1\right)^{5}}$$
Pyramid 864
Preview $$U_{864}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\arcsin{\left(\frac{3 \sqrt{3} \sqrt{\frac{x}{1 - y}}}{2} \right)}}{3} \right)}}{3 \sqrt{\frac{x}{1 - y}} \left(1 - y\right)}$$
Pyramid 865
Preview $$U_{865}(x, y) = \frac{1 - \sqrt{- 4 x \left(1 - y\right) + 1}}{2 x \left(1 - y\right)^{3}}$$
Pyramid 866
Preview $$U_{866}(x, y) = \frac{1}{\left(1 - y\right)^{5} \left(- x + \frac{1}{\left(1 - y\right)^{3}}\right)}$$
Pyramid 867
Preview $$U_{867}(x, y) = \left(1 - y\right)^{3} \left(x + \frac{1}{\left(1 - y\right)^{5}}\right)$$
Pyramid 868
Preview $$U_{868}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{\frac{x}{1 - y}}}{2} \right)}}{3} \right)}}{3 \sqrt{\frac{x}{1 - y}} \left(1 - y\right)^{3}}$$
Pyramid 869
Preview $$U_{869}(x, y) = \frac{1 - \sqrt{- 4 x \left(1 - y\right)^{2} + 1}}{2 x \left(1 - y\right)^{5}}$$
Pyramid 870
Preview $$U_{870}(x, y) = \frac{1}{\left(1 - y\right)^{3} \left(- x \left(1 - y\right)^{5} + 1\right)}$$
Pyramid 871
Preview $$U_{871}(x, y) = \left(1 - y\right)^{5} \left(x + \frac{1}{\left(1 - y\right)^{8}}\right)$$
Pyramid 872
Preview $$U_{872}(x, y) = \frac{2 \sqrt{3} \left(y + 1\right) \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x \left(y + 1\right)^{2}}}{2} \right)}}{3} \right)}}{3 \sqrt{x \left(y + 1\right)^{2}}}$$
Pyramid 873
Preview $$U_{873}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{\frac{x}{\sqrt{1 - 4 y}}}}{2} \right)}}{3} \right)}}{3 \sqrt{\frac{x}{\sqrt{1 - 4 y}}}}$$
Pyramid 874
Preview $$U_{874}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{\frac{x}{\sqrt{1 - 4 y}}}}{2} \right)}}{3} \right)}}{3 \sqrt{\frac{x}{\sqrt{1 - 4 y}}} \sqrt{1 - 4 y}}$$
Pyramid 875
Preview $$U_{875}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{\frac{x}{\sqrt{1 - 4 y}}}}{2} \right)}}{3} \right)}}{3 \sqrt{\frac{x}{\sqrt{1 - 4 y}}} \left(1 - 4 y\right)}$$
Pyramid 876
Preview $$U_{876}(x, y) = \frac{\sqrt{1 - 4 y} \left(1 - \sqrt{- \frac{4 x}{\sqrt{1 - 4 y}} + 1}\right)}{2 x}$$
Pyramid 877
Preview $$U_{877}(x, y) = \frac{2 - 2 \cos{\left(\frac{2 \arcsin{\left(\frac{3 \sqrt{3} \sqrt{x \left(y + 1\right)}}{2} \right)}}{3} \right)}}{3 x}$$
Pyramid 878
Preview $$U_{878}(x, y) = \frac{- 2 x \sqrt{4 y + 1} - \sqrt{- 4 x \sqrt{4 y + 1} + 1} + 1}{2 x^{2} \left(4 y + 1\right)}$$
Pyramid 879
Preview $$U_{879}(x, y) = \frac{\left(y + 1\right)^{2}}{\left(- \frac{x}{y + 1} + 1\right)^{2}}$$
Pyramid 880
Preview $$U_{880}(x, y) = \frac{2 x + y^{3} + 3 y^{2} + 3 y + \left(y + 1\right) \sqrt{4 x + y^{4} + 4 y^{3} + 6 y^{2} + y \left(4 x + 4\right) + 1} + 1}{2 y + 2}$$
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