Pyramid 1261
Preview $$U_{1261}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right)^{2}}{4 y^{2} \left(- \frac{x \left(1 - \sqrt{1 - 4 y}\right)^{2}}{4 y^{2}} + 1\right)^{3}}$$
Pyramid 1262
Preview $$U_{1262}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right)^{3}}{8 y^{3} \left(- \frac{x \left(1 - \sqrt{1 - 4 y}\right)^{3}}{8 y^{3}} + 1\right)^{3}}$$
Pyramid 1263
Preview $$U_{1263}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right) \sqrt{\frac{x \left(1 - \sqrt{1 - 4 y}\right)^{3}}{2 y^{3}} + 1}}{2 y}$$
Pyramid 1264
Preview $$U_{1264}(x, y) = \frac{\left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}{4 y^{4} \left(- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}{4 y^{4}} + 1\right)^{3}}$$
Pyramid 1265
Preview $$U_{1265}(x, y) = \frac{\left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}{8 y^{6} \left(- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}{8 y^{6}} + 1\right)^{3}}$$
Pyramid 1266
Preview $$U_{1266}(x, y) = \frac{1 - \sqrt{- \frac{4 x}{\left(1 - y\right)^{3}} + 1}}{2 x}$$
Pyramid 1267
Preview $$U_{1267}(x, y) = \frac{1 - \sqrt{- \frac{x \left(1 - \sqrt{1 - 4 y}\right)^{3}}{2 y^{3}} + 1}}{2 x}$$
Pyramid 1268
Preview $$U_{1268}(x, y) = \frac{1 - \sqrt{- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}{y^{4}} + 1}}{2 x}$$
Pyramid 1269
Preview $$U_{1269}(x, y) = \frac{1 - \sqrt{- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}{2 y^{6}} + 1}}{2 x}$$
Pyramid 1270
Preview $$U_{1270}(x, y) = \frac{\sqrt{2} \sqrt{\frac{1 - \sqrt{1 - 16 y}}{y}} \left(x + 1\right)}{4}$$
Pyramid 1271
Preview $$U_{1271}(x, y) = \left(y + 1\right) \sqrt{4 x \left(y + 1\right) + 1}$$
Pyramid 1272
Preview $$U_{1272}(x, y) = \frac{\left(1 - \sqrt{- 4 x \left(y + 1\right)^{3} + 1}\right)^{2}}{4 x^{2} \left(y + 1\right)^{3}}$$
Pyramid 1273
Preview $$U_{1273}(x, y) = \frac{\left(1 - y\right)^{3} \left(1 - \sqrt{- \frac{4 x}{\left(1 - y\right)^{3}} + 1}\right)^{2}}{4 x^{2}}$$
Pyramid 1274
Preview $$U_{1274}(x, y) = \frac{y^{2} \left(1 - \sqrt{- \frac{x \left(1 - \sqrt{1 - 4 y}\right)^{2}}{y^{2}} + 1}\right)^{2}}{x^{2} \left(1 - \sqrt{1 - 4 y}\right)^{2}}$$
Pyramid 1275
Preview $$U_{1275}(x, y) = \frac{2 y^{3} \left(1 - \sqrt{- \frac{x \left(1 - \sqrt{1 - 4 y}\right)^{3}}{2 y^{3}} + 1}\right)^{2}}{x^{2} \left(1 - \sqrt{1 - 4 y}\right)^{3}}$$
Pyramid 1276
Preview $$U_{1276}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right)^{3} \sqrt{\frac{x \left(1 - \sqrt{1 - 4 y}\right)^{3}}{2 y^{3}} + 1}}{8 y^{3}}$$
Pyramid 1277
Preview $$U_{1277}(x, y) = \frac{y^{4} \left(1 - \sqrt{- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}{y^{4}} + 1}\right)^{2}}{x^{2} \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}$$
Pyramid 1278
Preview $$U_{1278}(x, y) = \frac{2 y^{6} \left(1 - \sqrt{- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}{2 y^{6}} + 1}\right)^{2}}{x^{2} \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}$$
Pyramid 1279
Preview $$U_{1279}(x, y) = \frac{\left(1 - \sqrt{- 4 x \left(y + 1\right) + 1}\right)^{3}}{8 x^{3} \left(y + 1\right)^{2}}$$
Pyramid 1280
Preview $$U_{1280}(x, y) = \frac{2 y + \sqrt{4 y^{2} + 1}}{\left(1 - x\right)^{3}}$$
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