BSD 4_4 development

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ACOS(3)                     BSD Programmer's Manual                    ACOS(3)

N\bNA\bAM\bME\bE
     a\bac\bco\bos\bs - arc cosine function

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     #\b#i\bin\bnc\bcl\blu\bud\bde\be <\b<m\bma\bat\bth\bh.\b.h\bh>\b>

     _\bd_\bo_\bu_\bb_\bl_\be
     a\bac\bco\bos\bs(_\bd_\bo_\bu_\bb_\bl_\be _\bx);

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     The a\bac\bco\bos\bs() function computes the principal value of the arc cosine of _\bx.
     A domain error occurs for arguments not in the range [-1, +1].  For a
     discussion of error due to roundoff, see math(3).

R\bRE\bET\bTU\bUR\bRN\bN V\bVA\bAL\bLU\bUE\bES\bS
     The a\bac\bco\bos\bs() function returns the arc cosine in the range [0, pi] radians.
     On the VAX and Tahoe, if:

           |_\bx| > 1,

     a\bac\bco\bos\bs(_\bx) sets the global variable _\be_\br_\br_\bn_\bo to EDOM and a reserved operand
     fault is generated.

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
     sin(3),  cos(3),  tan(3),  asin(3),  atan(3),  atan2(3),  sinh(3),
     cosh(3),  tanh(3),  math(3),

S\bST\bTA\bAN\bND\bDA\bAR\bRD\bDS\bS
     The a\bac\bco\bos\bs() function conforms to ANSI C X3.159-1989 (``ANSI C '').

4.4BSD                           June 4, 1993                                1