4.4BSD/usr/share/man/cat3/acos.0

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

NNAAMMEE
     aaccooss - arc cosine function

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<mmaatthh..hh>>

     _d_o_u_b_l_e
     aaccooss(_d_o_u_b_l_e _x);

DDEESSCCRRIIPPTTIIOONN
     The aaccooss() function computes the principal value of the arc cosine of _x.
     A domain error occurs for arguments not in the range [-1, +1].  For a
     discussion of error due to roundoff, see math(3).

RREETTUURRNN VVAALLUUEESS
     The aaccooss() function returns the arc cosine in the range [0, pi] radians.
     On the VAX and Tahoe, if:

           |_x| > 1,

     aaccooss(_x) sets the global variable _e_r_r_n_o to EDOM and a reserved operand
     fault is generated.

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

SSTTAANNDDAARRDDSS
     The aaccooss() function conforms to ANSI C X3.159-1989 (``ANSI C '').

4.4BSD                           June 4, 1993                                1