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687

Centuries: 6th century - 7th century - 8th century

Decades: 630s 640s 650s 660s 670s - 680s - 690s 700s 710s 720s 730s

Years: 682 683 684 685 686 - 687 - 688 689 690 691 692


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Deaths:



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Quadratic formula

... should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have two; only ...

 
 
 
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