C in a Nutshell

Name

ccos

Synopsis

Calculates the cosine of a complex number

#include <complex.h>
double complexccos( double complex z );
float complex ccosf( float complex z );
long double complex ccosl( long double complex z );

The ccos() function returns the cosine of its complex number argument z, which is equal to (e^iz + e^−iz)/2.

Example

/* Demonstrate the exponential definition
 * of the complex cosine function.
 */
double complex z = 2.2 + 3.3 * I;
double complex c, d;

c =ccos( z );
d = 0.5 * ( cexp( z * I ) + cexp( − z * I ));

printf( "The ccos() function returns %.2f %+.2f \xD7 I.\n",
        creal(c), cimag(c) );
printf( "Using the cexp() function, the result is %.2f %+.2f \xD7 I.\n",
        creal(d), cimag(d) );

This code produces the following output:

The ccos() function returns -7.99 -10.95 × I.
Using the cexp() function, the result is -7.99 -10.95 × I.

See Also

csin(), ctan(), cacos(), casin(), catan(), cexp()