Amid the chaos of revolutionary France, one man’s mathematical obsession gave way to a calculation that now underpins much of ...

Excel has over 475 formulas in its Functions Library, but we've selected the most popular, from date and time functions to mathematics and simple data manipulation.

A FACT or FACTDOUBLE function is both a Math and Trigonometry function. Learn how to use both the FACT and FACTDOUBLE functions in Excel.