Complex sine function
double complex csin(double complex z);
float complex csinf(float complex z);
long double complex csinl(long double complex z);
Link with -lm.
The complex sine function is defined as:
csin(z) = (exp(i * z) - exp(-i * z)) / (2 * i)
These functions first appeared in glibc in version 2.1.
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