HP 20b HP 20b Calculator Quick Start Guide - Page 29

Trigonometry, Hyperbolic, Probability

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Mathematical Calculations Press < to scroll through the menu items, starting with Trigonometry. The Trigonometry, Hyperbolic, and Probability items have sub-menus. Press I with an item displayed to access the functions within the sub menus. Press O to cancel the Math menu and return to current work. Press :s to return to the top of the Math menu. Using the Math menu, calculate Sin -1 (0.5). See Table 2-4. Table 2-4 Math Menu Example Keys Display .5I :s Description Enters 0.5 and opens the Math menu starting with Trigonometry. I< I or = Selects the Trigonometry menu item and scrolls to ASIN. Note the value for Sin -1 is calculated immediately and displayed. Validates the result. Note: in the Math menu, PI does not perform calculations; it overrides the current number by PI. You may start an operation, use the Math menu to execute a 29

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Mathematical Calculations
29
Press
<
to scroll through the menu items, starting with
Trigonometry
. The
Trigonometry
,
Hyperbolic
, and
Probability
items have sub-menus. Press
I
with an item displayed to access the functions within the sub menus.
Press
O
to cancel the Math menu and return to current work.
Press
:s
to return to the top of the Math menu.
Using the Math menu, calculate Sin
-1
(0.5). See Table 2-4.
Table 2-4
Math Menu Example
Keys
Display
Description
.5I
:s
Enters 0.5 and opens the Math
menu starting with
Trigonometry
.
I<
Selects the
Trigonometry
menu item
and scrolls to ASIN. Note the value
for
Sin
-1
is calculated immediately
and displayed.
I
or
=
Validates the result.
Note: in the Math menu,
PI
does not perform calculations; it overrides the current
number by
PI
. You may start an operation, use the Math menu to execute a