Casio fx-570EX User Manual

When I execute a function calculation, why do I get a calculation result
that is completely different from older CASIO calculator models?
→ With a Natural Textbook Display model, the argument of a function that
uses parentheses must be followed by a closing parenthesis. Failing to
press  after the argument to close the parentheses may cause
unwanted values or expressions to be included as part of the
argument.
Example: (sin 30) + 15 (Angle Unit: Degree)
Older (S-V.P.A.M.) Model:
3015
15.5
Natural Textbook Display Model:
(LineI/LineO)
3015 
15.5
Failure to press  here as shown below will result in calculation of sin
45.
3015
0.7071067812
43

Casio fx-570EX Specifications

General

Type	Scientific
Cover	Yes
Form factor	Desktop
Control type	Buttons
Product color	Black
Housing material	Plastic
Symbolic notation	Fraction, Square root
Digits	12 digits
Display type	Dot-matrix
Second display	No
Battery life	3 year(s)
Battery type	AAA
Power source	Battery
Power consumption (typical)	0.0006 W
Number of batteries supported	1

Weight and Dimensions

Depth	165.5 mm
Width	77 mm
Height	13.8 mm
Weight	100 g