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1996-09-02
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877b
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30 lines
ACOSH(3) UNIX 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)
_f_l_o_a_t
aaccoosshhff(_f_l_o_a_t _x)
DDEESSCCRRIIPPTTIIOONN
The aaccoosshh() and aaccoosshhff() functions compute the inverse hyperbolic cosine
of the real argument _x.
RREETTUURRNN VVAALLUUEESS
Exceptional cases are handled by matherr(3).
SSEEEE AALLSSOO
asinh(3), atanh(3), exp(3), infnan(3), math(3), matherr(3)
HHIISSTTOORRYY
The aaccoosshh() function appeared in 4.3BSD.
4.3 Berkeley Distribution May 6, 1991 1