HP 40gs User Manual
Page 205
Computer Algebra System (CAS)
14-23
Typing:
gives:
2
NOTE: To find the limit as x approaches a
+
(resp a
–
), the
second argument is written:
X=A+0(resp X=A-0)
For the following expression, find the limit as x
approaches +∞:
Typing:
produces (after a short wait):
NOTE: the symbol ∞ is obtained by typing SHIFT 0.
To obtain –∞:
(–)∞
To obtain +∞:
(–)(–)∞
You can also find the symbol ∞ in the
MATH key’s
Constant menu.
PREVAL
Evaluate a primitive
PREVAL has three parameters: an expression F(VX)
dependent on the variable contained in VX, and two
expressions A and B.
For example, if VX contains X, and if F is a function,
PREVAL (F(X),A,B) returns F(B)-F(A).
lim
N TAN X
( ) TAN N X )
⋅
(
–
⋅
SIN N X
⋅
(
) N SIN X
( )
⋅
–
----------------------------------------------------------------- 0
,
⎝
⎠
⎛
⎞
x
x
x
+
+
x
–
lim
X
X
X
+
+
X
∞
+
,
–
⎝
⎠
⎛
⎞
1
2
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hp40g+.book Page 23 Friday, December 9, 2005 1:03 AM