HP 40gs User Manual page 211

hp40g+.book Page 29 Friday, December 9, 2005 1:03 AM
EPSX0
EXPLN
EXP2POW
Computer Algebra System (CAS)
Typing:
DISTRIB((X+1)·(X+2)·(X+3))
gives:
⋅ ( ) ⋅ ( )
x x + 2 x + 3 + 1
Disregard small values
EPSX0 has as a parameter an expression in X, and returns
the same expression with the values less than EPS
replaced by zeroes.
Typing:
EPSX0(0.001 + X)
gives, if EPS=0.01:
0 + x
or, if EPS=0.0001:
.001 + x
Transform a trigonometric expression into complex
exponentials
EXPLN takes as an argument a trigonometric expression.
It transforms the trigonometric function into exponentials
and logarithms without linearizing it.
EXPLN puts the calculator into complex mode.
Typing:
EXPLN(SIN(X))
gives:
1
( i x ⋅ )
---------------------- -
exp –
( i x ⋅ )
exp
----------------------------------------------------
2 i ⋅
∗
Transform exp(n ln(x)) as a power of x
EXP2POW transforms an expression of the form
exp(n × ln(x)), rewriting it as a power of x.
⋅ ( ) ⋅ ( )
x + 2 x + 3
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