CSIN(3) | Library Functions Manual | CSIN(3)

# NAME

`csin`, `csinf`, `csinl` — complex circular sine

# SYNOPSIS

Math Library (libm, -lm)
`#include <complex.h>`

double complex
`csin`(double complex z);

float complex
`csinf`(float complex z);

long double complex
`csinl`(long double complex z);

# DESCRIPTION

The `csin`(), `csinf`() and `csinl`() functions compute the complex circular sine of z.

If z = x + iy, then

    csin(z) = sin(x) cosh(y) + i cos(x) sinh(y).

# RETURN VALUES

The `csin`(), `csinf`() and `csinl`() functions return the complex circular sine of z.

# SEE ALSO

ccos(3), ctan(3)

# STANDARDS

The `csin`(), `csinf`() and `csinl`() functions conform to ISO/IEC 9899:1999 (“ISO C99”).

June 7, 2025 | Debian