Acos, 327 acos – Apple iWork '09 User Manual
Page 327
Chapter 12
Trigonometric Functions
327
Function
Description
The DEGREES function returns the number of
degrees in an angle expressed in radians.
The RADIANS function returns the number of
radians in an angle expressed in degrees.
The SIN function returns the sine of an angle that
is expressed in radians.
The SINH function returns the hyperbolic sine of
the specified number.
The TAN function returns the tangent of an angle
that is expressed in radians.
The TANH function returns the hyperbolic
tangent of the specified number.
ACOS
The ACOS function returns the inverse cosine (arccosine) of a number.
ACOS(num)
Â
num: A number. num is a number value in the range –1 to 1.
Usage Notes
The ACOS function takes a cosine value and returns a corresponding angle. The
Â
resulting angle is expressed in radians, in the range 0 to
π (pi). To see the resulting
angle in degrees instead of radians, wrap this function in the DEGREES function;
that is, =DEGREES(ACOS(num)).
Examples
=ACOS(SQRT(2)/2) returns 0.785398163397448, which is approximately
π/4.
=ACOS(0.54030230586814) returns 1.
=DEGREES(ACOS(.5)) returns 60, the degree measure of an angle that has a cosine of 0.5.
Related Topics
For related functions and additional information, see: