COS(3M) | Mathematical Library Functions | COS(3M) |

cos, cosf, cosl - cosine function

c99 [flag... ]file...-lm[library... ] #include <math.h>doublecos(doublex);

floatcosf(floatx);

long doublecosl(long doublex);

These functions compute the cosine of *x*, measured in
radians.

Upon successful completion, these functions return the cosine of
*x*.

If *x* is NaN, NaN is returned.

If *x* is +0, 1.0 is returned.

If *x* is ±Inf, a domain error occurs and a NaN is
returned.

These functions will fail if:

**Domain Error**

The *x* argument is ±Inf.

If the integer expression (**math_errhandling** &
**MATH_ERREXCEPT**) is non-zero, the invalid floating-point exception is
raised.

An application wanting to check for exceptions should call
**feclearexcept**(**FE_ALL_EXCEPT**) before calling these functions.
On return, if **fetestexcept**(**FE_INVALID** | **FE_DIVBYZERO** |
**FE_OVERFLOW** | **FE_UNDERFLOW**) is non-zero, an exception has been
raised. An application should either examine the return value or check the
floating point exception flags to detect exceptions.

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | Standard |

MT-Level | MT-Safe |

math.h(3HEAD), acos(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), sin(3M), tan(3M), attributes(7), standards(7)

July 12, 2006 | SunOS 5.11 |