HP 33S, User Manual

Page: 109 / 388

Entering and Evaluating Equations
6–17
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Single
letter
name
No implied
multiplication
Division is done
before addition
Parentheses used to group items
P=A+B+Hx(1 SIN(T)+1 SIN(F))
÷ ÷
Th
e 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 =
/n) sin(
) / cos(
4
1
π
π
n
n d
2
d
2 /n π
You can specify this equation as

π

π

Notice how the operators and functions combine to give the desired equation.
You can enter the equation into the equation list using the following keystrokes:
º d h
A
º Ð
.25
¸ h
N
¸ h
D
)
2
¸ n º
j ¯ h N º | ¯ k º j ¯ h N º | Ï