Apple iWork '09 - Manual (Page 329)

Chapter 12 Trigonometric Functions 329
ASIN
The ASIN function returns the arcsine (the inverse sine) of a number.
ASIN(num)
 num: A number. num is a number value that must be greater than or equal to 1.
Usage Notes
The ASIN function takes a sine and returns the corresponding angle. The result Â
is expressed in radians, in the range –pi/2 to +pi/2. To see the resulting angle in
degrees instead of radians, wrap this function in the DEGREES function; that is,
=DEGREES(ASIN(num)).
Examples
=ASIN(0.841470985) returns 1, the radian measure (approximately 57.3 degrees) of the angle that has
a sine of 0.8411470984807897.
=DEGREES(ASIN(0.5)) returns 30, the degree measure of the angle that has a sine of 0.5.
Related Topics
For related functions and additional information, see:
“ASINH” on page 329
“DEGREES” on page 334
“SIN” on page 336
“SINH” on page 337
“Listing of Trigonometric Functions” on page 326
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41
ASINH
The ASINH function returns the inverse hyperbolic sine of a number.
ASINH(num)
 num: A number. num is a number value.