HP -22S Owner's Manual page 141

Q.
How do I indicate multiplication in an equation?
A. You must use the multiplication sign
(0). You
cannot
use implied
multiplication-for example, AB for AxB.
Q.
What does the colon in the display mean?
A. It separates the two numbers entered as
ntllNPUT
I
n2
in statistics or
two-argument functions.
Q.
My numbers contain commas instead of periods as decimal points.
How do I restore the periods?
A. Changing the decimal point is covered in "Interchanging the Pe-
riod and Comma'" on page 25.
Q.
What does an "E'" in a number (for example,
2.51 E-13)
mean?
A. The number is displayed in scientific or engineering notation (see
page 23).
Q.
The calculator has displayed the message
MEMORY
FULL. What
should I do?
A. You must clear a portion of memory before proceeding (see "Clear-
ing Portions of Memory" on page 28).
Q.
How can I change the sign of a number?
A.
Press~.
Q.
Why does calculating the sine of
1£'
radians display a very small
number instead of O?
A.
1£'
cannot be represented
exactly
with the 12-digit precision of the
calculator. The calculated answer is correct for the 12-digit approxima-
tion of
1£'.
Q.
Why do I get incorrect answers when I use the trigonometric
functions?
A. You must make sure you are in the correct angular mode (see page
45.)
A: Assistance, Batteries, Memory, and Service 141