HP 39g Graphing Calculator - Manual (Page 147)

Constants
The HP 39G/40G has an internal numeric representation for
these constants.
e Natural logarithm base. Internally represented as
2.71828182846.
e
i Imaginary value for V~1 , the complex number (0,1).
i
MAXREAL Maximum real number. Internally represented as
9.99999999999 x 10'^'^'^.
MAXREAL
MINREAL
-499
Minimum real number. Internally represented as 1 x 1 0
MINREAL
K Internally represented as 3.14159265359.
71
Hyperbolic trigonometry
The hyperbolic trigonometry functions can also lake complex
numbers as arguments.
ACOSH Inverse hyperbolic cosine : cosh^'v.
ACOSH(va/«e)
ASINH
Inverse hyperbolic sine : sinh~'v.
ASINH(va/«e)
ATANH Inverse hyperbolic tangent; tanh“*x.
ATANHfvatee)
COSH Hyperbolic cosine
C O S n ( v a l u e )
SINH Hyperbolic sine.
SINH(vafae)
TANH Hyperbolic tangent.
TANH(va/«e)
Using mathematical functions 10-9