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Before the advent of computers, printed [[lookup table]]s of values were used by people to speed up hand calculations of complex functions, such as in [[trigonometric table]]s, [[Common logarithm|logarithm tables]], and tables of [[statistical density function]]s<ref>{{cite book
|editor1-last= Campbell-Kelly
|editor1-first= Martin|editor1-link=Martin Campbell-Kelly
|editor2-last= Croarken
|editor2-first= Mary|editor2-link=Mary Croarken
|editor3-last= Flood|editor3-link=Raymond Flood (mathematician)
|editor3-first= Raymond
|display-editors = 3 |editor4-last= Robson|editor4-link=Eleanor Robson
|editor4-first= Eleanor
|title= The History of Mathematical Tables From Sumer to Spreadsheets
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