ccos(3) Library Functions Manual ccos(3) ccos, ccosf, ccosl - (libm -lm) #include double complex ccos(double complex z); float complex ccosf(float complex z); long double complex ccosl(long double complex z); z. : ccos(z) = (exp(i * z) + exp(-i * z)) / 2 attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |ccos(), | | MT-Safe | |ccosf(), | | | |ccosl() | | | +------------+------------------------------------+--------------------+ C11, POSIX.1-2008. glibc 2.1. C99 POSIX.1-2001. cabs(3) cacos(3) csin(3) ctan(3) complex(7) 3 . . : . 6.18 8 2026 ccos(3)