Sharp EL-738

78
Calculation ranges of functions
• Within the ranges specifi ed, this calculator is accurate to within ±1
of the least signifi cant digit of the mantissa. However, a calculation
error increases in continuous calculations due to accumulation of
each calculation error. (This is the same for fi nancial calculations,
scientifi c calculations [
y
x
,
x
,
e
x
, ln, n!, etc.], where continuous
calculations are performed internally.)
Additionally, a calculation error will accumulate and become larger
in the vicinity of infl ection points and singular points of functions.
In fi nancial calculations, a calculation error increases if the
interest is low or the number of payments is high. Press
s
if you’d like to cancel the calculation while the “calculating!”
screen is displayed.
• Calculation ranges
±10
–99
to ±9.999999999
×
10
99
and 0.
If the absolute value of an entry or a fi nal or intermediate result
of a calculation is less than 10
–99
, the value is considered to be
0 in calculations and in the display.
Function Calculation range
sin
x
, cos
x
,
tan
x
DEG: |
x
| < 10
10
(tan
x
: |
x
|
≠
90 (2n – 1))*
π
RAD: |
x
| <
—
×
10
10
180
π
(tan
x
: |
x
|
≠
— (2n – 1))*
2
10
GRAD: |
x
| <
—
×
10
10
9
(tan
x
: |
x
|
≠
100 (2n – 1))*
sin
–1
x
, cos
–1
x
|
x
|
≤
1
tan
–1
x
|
x
| < 10
100
In
x
, log
x
10
–99
≤
x
< 10
100
y
x
•
y
> 0: –10
100
<
x
log
y
< 100
•
y
= 0: 0 <
x
< 10
100
•
y
< 0:
x
= n
(0 < |
x
| < 1:
1
—
x

= 2n – 1,
x
≠
0),*
–10
100
<
x
log |
y
| < 100
Appendix.indd78Appendix.indd78 06.7.108:42:14PM06.7.108:42:14PM