double complex ccos(double complex z);
float complex ccosf(float complex z);
long double complex ccosl(long double complex z);
Link with -lm.
The complex cosine function is defined as:
ccos(z) = (exp(i * z) + exp(-i * z)) / 2
These functions first appeared in glibc in version 2.1.
cabs(3), csin(3), ctan(3), complex(7)
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