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Allenalin

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man cexp:

Linux Programmer's Manual                   CEXP(3)

NAME
       cexp, cexpf, cexpl - complex exponential function

SYNOPSIS
       #include

       double complex cexp(double complex z);
       float complex cexpf(float complex z);
       long double complex cexpl(long double complex z);

       Link with -lm.

DESCRIPTION
       The  function calculates e (2.71828..., the base of natural logarithms)
       raised to the power of z.

       One has:

           cexp(I * z) = ccos(z) + I * csin(z)

VERSIONS
       These functions first appeared in glibc in version 2.1.

CONFORMING TO
       C99.
================
debian:~$ man csin
CSIN(3)                         Linux Programmer's Manual                        CSIN(3)

NAME
       csin, csinf, csinl - complex sine function

SYNOPSIS
       #include

       double complex csin(double complex z);
       float complex csinf(float complex z);
       long double complex csinl(long double complex z);

       Link with -lm.

DESCRIPTION
       The complex sine function is defined as:

           csin(z) = (exp(i * z) - exp(-i * z)) / (2 * i)

VERSIONS
       These functions first appeared in glibc in version 2.1.

CONFORMING TO
       C99.

SEE ALSO
       cabs(3), ccos(3), ctan(3), complex(7)
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