NAME

cosd(), cosdf() − degree-valued cosine functions

SYNOPSIS

#include <math.h>

double cosd(double x);

float cosdf(float x);

DESCRIPTION

cosd() is a degree-valued version of the cos() function. It returns the cosine of x (x specified in degrees). 

cosd() may lose accuracy when x is far from zero. 

cosdf() is a float version of cosd(); it takes a float argument and returns a float result.  To use this function, compile either with the −Ae option or with the −Aa and −D_HPUX_SOURCE options.  Otherwise, the compiler promotes the float argument to double, and the function returns incorrect results. 

cosd() and cosdf() are not specified by any standard, but cosdf() is named in accordance with the conventions specified in the "Future Library Directions" section of the ANSI C standard. 

To use these functions, link in the math library by specifying −lm on the compiler or linker command line. 

RETURN VALUE

If x is NaN or ±INFINITY, cosd() returns NaN. 

If the correct value after rounding would be smaller in magnitude than MINDOUBLE, cosd() returns zero. 

ERRORS

No errors are defined. 

SEE ALSO

cos(3M), sind(3M), tand(3M), asind(3M), acosd(3M), atand(3M), atan2d(3M), isinf(3M), isnan(3M), values(5). 

Hewlett-Packard Company  —  HP-UX Release 10.20:  July 1996