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Pyramid 981
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$$U_{981}(x, y) = \left(1 - \frac{4 \sin^{2}{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{- x \left(y + 1\right)}}{2} \right)}}{3} \right)}}{3}\right) \left(y + 1\right)^{2}$$
Pyramid 982
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$$U_{982}(x, y) = \frac{\sqrt{4 x \left(y + 1\right) + 1} + 1}{2 y + 2}$$
Pyramid 983
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$$U_{983}(x, y) = \frac{\sqrt{4 x \left(y + 1\right) + 1} + 1}{2 \left(y + 1\right)^{2}}$$
Pyramid 984
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$$U_{984}(x, y) = \frac{\left(y + 1\right)^{2} \left(\sqrt{4 x \left(y + 1\right) + 1} + 1\right)}{2}$$
Pyramid 985
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$$U_{985}(x, y) = \left(y + 1\right)^{2} \left(x \left(y + 1\right) + 1\right)$$
Pyramid 986
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$$U_{986}(x, y) = \frac{x \left(y + 1\right) + 1}{\left(y + 1\right)^{2}}$$
Pyramid 987
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$$U_{987}(x, y) = \frac{1}{\left(y + 1\right) \left(- x \left(y + 1\right) + 1\right)}$$
Pyramid 988
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$$U_{988}(x, y) = \frac{1}{\left(y + 1\right)^{2} \left(- x \left(y + 1\right) + 1\right)}$$
Pyramid 989
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$$U_{989}(x, y) = \frac{1 - \sqrt{- 4 x \left(y + 1\right) + 1}}{2 x \left(y + 1\right)^{2}}$$
Pyramid 990
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$$U_{990}(x, y) = \frac{1 - \sqrt{- 4 x \left(y + 1\right) + 1}}{2 x \left(y + 1\right)^{3}}$$
Pyramid 991
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$$U_{991}(x, y) = \frac{- 2 x \left(y + 1\right) - \sqrt{- 4 x \left(y + 1\right) + 1} + 1}{2 x^{2} \left(y + 1\right)^{2}}$$
Pyramid 992
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$$U_{992}(x, y) = \frac{1 - \sqrt{- \sqrt{2} x \sqrt{\frac{1 - \sqrt{1 - 16 y}}{y}} + 1}}{2 x}$$
Pyramid 993
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$$U_{993}(x, y) = \frac{- 2 x \left(y + 1\right) - \sqrt{- 4 x \left(y + 1\right) + 1} + 1}{2 x^{2} \left(y + 1\right)^{3}}$$
Pyramid 994
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$$U_{994}(x, y) = \frac{- 2 x \left(y + 1\right) - \sqrt{- 4 x \left(y + 1\right) + 1} + 1}{2 x^{2} \left(y + 1\right)^{4}}$$
Pyramid 995
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$$U_{995}(x, y) = \frac{\left(x + 1\right)^{2}}{\sqrt{- 4 y \left(x + 1\right) + 1}}$$
Pyramid 996
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$$U_{996}(x, y) = \frac{1}{\left(x + 1\right) \sqrt{- y \left(4 x + 4\right) + 1}}$$
Pyramid 997
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$$U_{997}(x, y) = \frac{1}{\left(x + 1\right)^{2} \sqrt{- y \left(4 x + 4\right) + 1}}$$
Pyramid 998
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$$U_{998}(x, y) = \frac{1 - y}{- \frac{x}{1 - y} + 1}$$
Pyramid 999
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$$U_{999}(x, y) = \frac{\left(1 - y\right)^{2}}{- \frac{x}{1 - y} + 1}$$
Pyramid 1000
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$$U_{1000}(x, y) = \frac{2 y}{\left(1 - \sqrt{1 - 4 y}\right) \left(- \frac{x \left(1 - \sqrt{1 - 4 y}\right)}{2 y} + 1\right)}$$
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