Function calculations, E-18 – Casio FX-85GT PLUS User Manual
Page 19
E-18
Function Calculations
For actual operations using each function, see the “Examples” section
following the list below.
e
:
e
is displayed as 2.718281828, but
e
= 2.71828182845904 is used for
internal calculations.
sin, cos, tan, sin
−1
, cos
−1
, tan
−1
: Trigonometric functions. Specify the angle
unit before performing calculations. See
1
.
sinh, cosh, tanh, sinh
−1
, cosh
−1
, tanh
−1
: Hyperbolic functions. Input a
function from the menu that appears when you press
E. The angle unit
setting does not affect calculations. See
2
.
°,
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). See
3
.
,
: Exponential functions. Note that the input method is different
depending upon whether you are using Natural Display or Linear Display.
See
4
.
log: Logarithmic function. 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. See
5
.
ln: Natural logarithm to base
e
. See
6
.
x
2
,
x
3
,
x
9, , , ,
x
−1
: Powers, power roots, and reciprocals. Note
that the input methods for
x
9, , , and
and
are different depending upon
are different depending upon
whether you are using Natural Display or Linear Display. See
7
.
Note: The following functions cannot be input in consecutive sequence:
x
2
,
x
3
,
x
9,
x
−1
. If you input 2
77, for example, the final 7 will be ignored. To
input 2
22
, input 2
7, press the B key, and then press 7().
Pol, Rec : Pol converts rectangular coordinates to polar coordinates, while
Rec converts polar coordinates to rectangular coordinates. See
8
.
Pol(
x
,
y
) = (
r
,
Ƨ)
Rec(
r
,
Ƨ) = (
x
,
y
)
Rectangular
Polar
Coordinates (Rec) Coordinates (Pol)
Specify the angle unit before
performing calculations.
The calculation result for
r
and
Ƨ
and for
x
and
y
are each assigned
respectively to variables X and Y.
Calculation result
Q is displayed
in the range of −180°
Q
180°.
x
! : Factorial function. See
9
.
Abs : Absolute value function. Note that the input method is different
depending upon whether you are using Natural Display or Linear Display.
See
10
.
Ran# : Generates a 3-digit pseudo random number that is less than 1. The
result is displayed as a fraction when Natural Display is selected. See
11
.