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Doing Arithmetic - HP -28S Manual

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2
Doing Arithmetic
There are two ways to do arithmetic on the HP-28S. You can do
arithmetic using the stack, as you did in the previous chapter, or you
can enter an
expression
representing the calculation. In the previous
chapter you calculated:
(15
+
23) x sin 30°
Here's how to make the same calculation using an expression.
Clear the stack and select the TRIG menu .
• , CLEAR
II
TRIG
I
Start the expression.
~
The cursor changes, indicating
Algebraic Entry mode.
You'll see the ef-
fects of this entry mode as you key in the expression.
Key in the first part of the expression.
~----------------------~
rn
15
[B
23
.CD
I;
34
2: Doing Arithmetic
1(15+23)~
IImImI:llIIlBIllImlmC:ll'lllll3
I

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