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FreeBSD 11.0 - man page for ctan (freebsd section 3)

CCOS(3) 						   BSD Library Functions Manual 						   CCOS(3)

ccos, ccosf, csin, csinf ctan, ctanf -- complex trigonometric functions
Math Library (libm, -lm)
#include <complex.h> double complex ccos(double complex z); float complex ccosf(float complex z); double complex csin(double complex z); float complex csinf(float complex z); double complex ctan(double complex z); float complex ctanf(float complex z);
The ccos(), csin(), and ctan() functions compute the cosine, sine, and tangent of the complex number z, respectively. The ccosf(), csinf(), and ctanf() functions perform the same operations in float precision.
cacos(3), ccosh(3), complex(3), cos(3), math(3), sin(3), tan(3)
These functions conform to ISO/IEC 9899:1999 (``ISO C99'').
October 17, 2011 BSD

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