cos, cosh
Calculate the cosine (cos) or hyperbolic cosine (cosh).
doublecos(doublex**);**
doublecosh(doublex**);**
| Routine | Required Header | Compatibility |
| cos | <math.h> | ANSI, Win 95, Win NT |
| cosh | <math.h> | ANSI, Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
The cos and cosh functions return the cosine and hyperbolic cosine, respectively, of x. If x is greater than or equal to 263, or less than or equal to –263, a loss of significance in the result of a call to cos occurs, in which case the function generates a _TLOSS error and returns an indefinite (same as a quiet NaN).
If the result is too large in a cosh call, the function returns HUGE_VAL and sets errno to ERANGE. You can modify error handling with _matherr.
Parameter
x
Angle in radians
Example
/* SINCOS.C: This program displays the sine, hyperbolic
* sine, cosine, and hyperbolic cosine of pi / 2.
*/
#include <math.h>
#include <stdio.h>
void main( void )
{
double pi = 3.1415926535;
double x, y;
x = pi / 2;
y = sin( x );
printf( "sin( %f ) = %f\n", x, y );
y = sinh( x );
printf( "sinh( %f ) = %f\n",x, y );
y = cos( x );
printf( "cos( %f ) = %f\n", x, y );
y = cosh( x );
printf( "cosh( %f ) = %f\n",x, y );
}
Output
sin( 1.570796 ) = 1.000000
sinh( 1.570796 ) = 2.301299
cos( 1.570796 ) = 0.000000
cosh( 1.570796 ) = 2.509178