ACOS
Section: C Library Functions (3)
Index
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BSD mandoc
NAME
acos
- arc cosine function
SYNOPSIS
Fd #include <math.h>
Ft double
Fn acos double x
DESCRIPTION
The
Fn acos
function computes the principal value of the arc cosine of
Fa x .
A domain error occurs for arguments not in the range [-1, +1].
For a discussion of error due to roundoff, see
math(3).
RETURN VALUES
The
Fn acos
function returns the arc cosine in the range
Bq 0 ,
radians.
On the
VAX
and
Tahoe
if:
| x | > 1
Fn acos x
sets the global variable
errno
to
EDOM
and a reserved operand fault is generated.
SEE ALSO
sin(3),
cos(3),
tan(3),
asin(3),
atan(3),
atan2(3),
sinh(3),
cosh(3),
tanh(3),
math(3),
STANDARDS
The
Fn acos
function conforms to
St -ansiC .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- SEE ALSO
-
- STANDARDS
-
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Time: 08:43:27 GMT, September 19, 2022