cos, cosf, cosl

Calculates the cosine.

Syntax

double cos( double x );
float cosf( float x );
long double cosl( long double x );
#define cos(X) // Requires C11 or later

float cos( float x );  // C++ only
long double cos( long double x );  // C++ only

Parameters

x
Angle in radians.

Return value

The cosine 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 occurs.

Remarks

Because C++ allows overloading, you can call overloads of cos that take and return float or long double values. In a C program, unless you're using the <tgmath.h> macro to call this function, cos always takes and returns a double.

If you use the <tgmath.h> cos() macro, the type of the argument determines which version of the function is selected. See Type-generic math for details.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

For more compatibility information, see Compatibility.

Example

See the example in sin, sinf, sinl.

See also

Math and floating-point support
acos, acosf, acosl
asin, asinf, asinl
atan, atanf, atanl, atan2, atan2f, atan2l
_matherr
sin, sinf, sinl
tan, tanf, tanl