HP 35s Scientific Calculator - Manual (Page 120)

6-18 Entering and Evaluating Equations
The next equation also obeys the syntax rules. This equation uses the inverse
function, , instead of the fractional form, . Notice that
the SIN function is "nested" inside the INV function. (INV is typed by
 .)

Example: Area of a Polygon.
The equation for area of a regular polygon with n sides of length d is:
Area =
You can specify this equation as
 ππ
Notice how the operators and functions combine to give the desired equation.
Parentheses used to group items
Single letter
name Optional explicit
multiplication Division is done before
addition
/n) sin(
) / cos(
4
1
π
π n
n d 2
d
2 /n π