HP 10bII+ Financial \5G, ]rc, ]rR, ]rC, YP\;, ]roc, ]roR, ]roC, PY7V\2, A7SG]oR

Table 2-16 Example using various trigonometric calculations

Keys	Display	Description
A7SG]oR	51.6839	Displays inverse cosine of 0.62.
4	17.8288	Calculates arccos 0.35 - arccos 0.62.
\5G	17.83	Return display to default format.

Pi

Pressing \;displays the value of π . Although the displayed value is appears in the current display format, the 12 digit value is actually used for calculations. π is often used during calculations in radians mode, as there are 2π radians in a circle.

Example

Find the surface area of a sphere with a radius of 4.5 centimeters. Use the formula: A = 4πr2

Table 2-17 Example using Pi

Keys	Display	Description
YP\;	3.14	Displays π .
PY7V\2	20.25	Displays 4.52.
4	254.47	Calculates sphere surface area
		in square centimeters.

Hyperbolic Functions

Table 2-18 Hyperbolic and inverse hyperbolic functions

Keys	Description
]rc	sinh.
	Calculates hyperbolic sine, written as,
]rR	Calculates hyperbolic cosine, written
	as, cosh.
]rC	Calculates hyperbolic tangent, written
	as, tanh.
]roc	Calculates inverse hyperbolic sine,
	written as, arcsinh, asinh, or, sinh-1.
]roR	Calculates inverse hyperbolic sine, also
	written, arccosh, acosh, or cosh-1.
]roC	Calculates inverse hyperbolic tangent,
	also written, arctanh, atanh, or tanh-1.

36 Getting Started