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1268

Centuries: 12th century - 13th century - 14th century

Decades: 1210s 1220s 1230s 1240s 1250s - 1260s - 1270s 1280s 1290s 1300s 1310s

Years: 1263 1264 1265 1266 1267 - 1268 - 1269 1270 1271 1272 1273

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Births

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Quadratic formula

... derived by the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( ...

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