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HP -28S Manual Page 207

Advanced scientific calculator.
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Degrees Mode ( D.EG .. , Flag 60 Clear). Real numbers represent
angular measure in degrees.
Radians Mode ( 'RM)" , Flag 60 Set,
(27r").
Real numbers repre-
sent angular measure in radians.
Beeper Mode
This mode controls whether the calculator makes sounds when an er-
ror occurs or BEEP is executed.
Beeper On (Flag 51 Clear). The calculator makes sounds.
Beeper Off (Flag 51 Set). The calculator is silent.
Principal Value
A solution returned by ISOL or QUAD generally requires arbitrary
signs (+
1
or
-1)
and integers (0, I, 2, ... ) to represent all possible
solutions. This mode determines whether arbitrary signs and integers
are included in solutions generated by ISOL or QUAD.
Principal Value Off (Flag 34 Clear). Solutions returned by ISOL
and QUAD include variables s1, s2, ... , for arbitrary signs and n1,
n2, ... , for arbitrary integers.
Principal Value On (Flag 34 Set). ISOL and QUAD take arbitrary
signs to be
+
1 and arbitrary integers to be O.
Constants Mode
This mode affects whether evaluation of a symbolic constant
(e,
i,
t' 1
I
t~R,
t1Ai<R,
or IT) returns its numerical value. In Numerical Results
mode (flag 36 clear), evaluation of a symbolic constant returns its nu-
merical value regardless of Constants Mode.
Symbolic Constants (Flag 35 Set). Evaluation of a symbolic con-
stant returns its symbolic form.
206
24: Modes

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