HP 33s Scientific HLA ’.25 zLN zLD 2 zR NqLN `qONqLN `‘, Cos π / n, Example Area of a Polygon

Parentheses used to group items

P=A+B+Hx(1ΊSIN(T)+1ΊSIN(F))

Single	No implied	Division is done
letter	multiplication	before addition
name

The next equation also obeys the syntax rules. This equation uses the inverse function, #1 1!22, instead of the fractional form, ª 1!2. Notice that the SIN function is "nested" inside the INV function. (INV is typed by .)

/--º1#1 1!22-#1 1222

Example: Area of a Polygon.

The equation for area of a regular polygon with n sides of length d is:

Area =	1	n d 2	cos(π / n)
	4		sin(π/n)

d

2π/n

You can specify this equation as

/)ºº:º 1πª2ª 1πª2

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:

HLA ’.25 zLN zLD 2 zR NqLN `qONqLN `‘

Entering and Evaluating Equations 6–17