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Man Pages


Manual Reference Pages  -  ACOSF (3)

NAME

acos, acosf, acosl - arc cosine functions

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

LIBRARY


.Lb libm

SYNOPSIS


.In math.h double acos double x float acosf float x long double acosl long double x

DESCRIPTION

The acos, acosf, and acosl functions compute the principal value of the arc cosine of x.

RETURN VALUES

These functions return the arc cosine in the range [0, pi] radians. If:

| x | > 1,

acos x raises an invalid exception and returns an NaN.

SEE ALSO

asin(3), atan(3), atan2(3), cos(3), cosh(3), fenv(3), math(3), sin(3), sinh(3), tan(3), tanh(3)

STANDARDS

The acos, acosf, and acosl functions conform to -isoC-99.
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