HP 39gs Graphing manual Hyperbolic trigonometry

→IN	Convert from centimeters to inches.
→L	Convert from US gallons to liters.
→LGAL	Convert from liters to US gallons.
→KG	Convert from pounds to kilograms.
→LBS	Convert from kilograms to pounds.
→KM	Convert from miles to kilometers.
→MILE	Convert from kilometers to miles.
→DEG	Convert from radians to degrees.
→RAD	Convert from degrees to radians.

Hyperbolic trigonometry

	The hyperbolic trigonometry functions can also take
	complex numbers as arguments.
ACOSH	Inverse hyperbolic cosine : cosh–1x.
	ACOSH(value)
ASINH	Inverse hyperbolic sine : sinh–1x.
	ASINH(value)
ATANH	Inverse hyperbolic tangent : tanh–1x.
	ATANH(value)
COSH	Hyperbolic cosine
	COSH(value)
SINH	Hyperbolic sine.
	SINH(value)
TANH	Hyperbolic tangent.
	TANH(value)
ALOG	Antilogarithm (exponential). This is more accurate than
	10^x due to limitations of the power function.
	ALOG(value)

Using mathematical functions 13-9