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

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

NNAAMMEE
     aassiinnhh - inverse hyperbolic sine function

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

     _d_o_u_b_l_e
     aassiinnhh(_d_o_u_b_l_e _x);

DDEESSCCRRIIPPTTIIOONN
     The aassiinnhh() function computes the inverse hyperbolic sine of the real ar-
     gument _x. For a discussion of error due to roundoff, see math(3).

RREETTUURRNN VVAALLUUEESS
     The aassiinnhh() function returns the inverse hyperbolic sine of _x.

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

HHIISSTTOORRYY
     The aassiinnhh() function appeared in 4.3BSD.

4.3 Berkeley Distribution        June 4, 1993                                1