hp40g+.book Page 32 Friday, December 9, 2005 1:03 AM

Typing:

SINCOS(EXP(i·X))

gives after turning on complex mode, if necessary: cos(x) + i · sin(x)

SIMPLIFYSimplify

SIMPLIFY simplifies an expression automatically.

Typing:

 

⎛SIN(3 ⋅ X) + SIN(7 ⋅ X)⎞

 

SIMPLIFY⎝---------------------------------

(

5

⋅

X

)

-⎠

 

 

SIN

 

 

 

 

gives, after simplification:

 

 

 

 

 

 

 

4 · cos(x)2 − 2

 

 

 

 

 

 

 

XNUM

Evaluation of reals

 

 

 

 

 

 

 

 

XNUM has an expression as a parameter.

 

XNUM puts the calculator into approximate mode and

 

returns the numeric value of the expression.

 

Typing:

 

 

 

 

 

 

 

 

XNUM(√2)

 

 

 

 

 

 

 

 

gives:

 

 

 

 

 

 

 

 

1.41421356237

 

 

 

 

 

 

 

XQ

Rational approximation

 

 

 

 

 

 

 

XQ has a real numeric expression as a parameter.

XQ puts the calculator into exact mode and gives a rational or real approximation of the expression.

Typing:

XQ(1.41421)

gives:

66441

--------------

46981

14-32

 

 

Computer Algebra System (CAS)