## Using Excel Functions:

We have already seen how Excel can be used to perform simple
calculations by typing equations into cells within the
spreadsheet. Obviously, we would want to perform calculations
using basic mathematical functions and constants, such as
sin *x*, log *y*, or *π*. In
this section, we will use Excel's built-in functions to
perform elementary calculations. Functions are entered in cells
as part of an equation; remember that equations in cells always
begin with an “=” sign. We will also use the
techniques learned in the preceding exercises to create a series
of values, fill cells in the same column with the same formula,
and perform calculations using both absolute and relative referencing.