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cos(3)                   BSD Library Functions Manual                   cos(3)


NAME

     cos -- cosine function


SYNOPSIS

     #include <math.h>

     double
     cos(double x);

     long double
     cosl(long double x);

     float
     cosf(float x);


DESCRIPTION

     The cos() function computes the cosine of x (measured in radians).


SPECIAL VALUES

     cos(+-0) returns 1.

     cos(+-infinity) returns a NaN and raises the "invalid" floating-point
     exception.


VECTOR OPERATIONS

     If you need to apply the cos() function to SIMD vectors or arrays, using
     the following functions provided by the Accelerate.framework may give
     significantly better performance:

     #include <Accelerate/Accelerate.h>

     vFloat vcosf(vFloat x);
     vFloat vsincosf(vFloat x, vFloat *c);
     void vvcosf(float *y, const float *x, const int *n);
     void vvcos(double *y, const double *x, const int *n);
     void vvsincosf(float *s, float *c, const float *x, const int *n);
     void vvsincos(double *s, double *c, const double *x, const int *n);


SEE ALSO

     sin(3), tan(3), asin(3), acos(3), atan(3), atan2(3), sinh(3), cosh(3),
     tanh(3), math(3)


STANDARDS

     The cos() function conforms to ISO/IEC 9899:2011.

BSD                            December 11, 2006                           BSD

Mac OS X 10.9.1 - Generated Tue Jan 7 08:24:08 CST 2014
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