1CACOS(3)                     complex math routines                    CACOS(3)
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NAME

6       cacos, cacosf, cacosl - complex arc cosine
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SYNOPSIS

9       #include <complex.h>
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11       double complex cacos(double complex z);
12       float complex cacosf(float complex z);
13       long double complex cacosl(long double complex z);
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15       Link with -lm.
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DESCRIPTION

18       The  cacos()  function calculates the complex acos().  If y = cacos(z),
19       then z = ccos(y).  The real part of y is chosen in the interval [0,pi].
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21       One has cacos(z) = -i clog(z+csqrt(z*z-1)).
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CONFORMING TO

24       C99
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SEE ALSO

27       ccos(3), clog(3), complex(7)
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31                                  2002-07-28                          CACOS(3)