Casio fx-991ES PLUS User Manual

(sinh) 1 1.175201194
Example 2: cosh
-1
1 = 0
(cosh
-1
) 1 0
Angle Unit Conversion
°,
r
,
g
: These functions specify the angle unit. ° specifies degrees,
r
radians, and
g
grads.
Input a function from the menu that appears when you perform the
following key operation: (DRG ).
Example: π/2 radians = 90°, 50 grads = 45° (Angle unit: Deg)
(π) 2 (DRG ) (
r
)
90
50 (DRG ) (
g
) 45
Exponential Functions
Note that the input method is different depending upon whether you are
using Natural Display or Linear Display.
Example: To calculate e
5
× 2 to three significant digits (Sci 3)
(SETUP) (Sci)
(MthlO-MathO) ( ) 5 2 2.97×10
2
(LinelO) ( ) 5 2 2.97×10
2
Logarithmic Functions
Use the
key to input log
a
b as log (a,b).
Base 10 is the default setting if you do not input anything for a.
The
key also can be used for input, but only while Natural Display is
selected. In this case, you must input a value for the base.
Example 1: log
10
1000 = log 1000 = 3
1000 3
Example 2: log
2
16 = 4
28

Casio fx-991ES PLUS Specifications

General

Type	Scientific
Cover	No
Form factor	Desktop
Control type	Buttons
Product color	Gray
Digits	15 digits
Display type	Dot-matrix
Display resolution	96 x 31 pixels
Display number of lines	10 lines
Storage media type	Not available
Battery life	3 year(s)
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Symbolic notation	Square root
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	162 mm
Width	80 mm
Height	11.1 mm
Weight	95 g