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

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

NNAAMMEE
     aaccoosshh - inverse hyperbolic cosine function

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

     _d_o_u_b_l_e
     aaccoosshh(_d_o_u_b_l_e _x);

DDEESSCCRRIIPPTTIIOONN
     The aaccoosshh() function computes the inverse hyperbolic cosine of the real
     argument _x. For a discussion of error due to roundoff, see math(3).

RREETTUURRNN VVAALLUUEESS
     The aaccoosshh() function returns the inverse hyperbolic cosine of _x. On the
     VAX and Tahoe, if the argument is less than one aaccoosshh() sets the global
     variable _e_r_r_n_o to EDOM and causes a reserved operand fault.

SSEEEE AALLSSOO
     asinh(3),  atanh(3),  exp(3),  infnan(3) math(3),

HHIISSTTOORRYY
     The aaccoosshh() function appeared in 4.3BSD.

4.3 Berkeley Distribution        June 4, 1993                                1