Computes the hyperbolic cosine.
#include <math.h> float coshf (x) float x; long double coshl (x) long double x; double cosh (x) double x;
The coshf, coshl, and cosh subroutines compute the hyperbolic cosine of the x parameter.
An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is nonzero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is nonzero, an error has occurred.
| x | Specifies the value to be computed. |
Upon successful completion, the coshf, coshl, and cosh subroutines return the hyperbolic cosine of x.
If the correct value would cause overflow, a range error occurs and the coshf, coshl, and cosh subroutines return the value of the macro HUGE_VALF, HUGE_VALL, and HUGE_VAL, respectively.
If x is NaN, a NaN is returned.
If x is ±0, the value 1.0 is returned.
If x is ±Inf, +Inf is returned.
acosh, acoshf, or acoshl Subroutine, feclearexcept Subroutine, fetestexcept Subroutine, and class, _class, finite, isnan, or unordered Subroutines
sinh, sinhf, or sinhl Subroutine and tanh, tanhf, or tanhl Subroutine in AIX 5L Version 5.2 Technical Reference: Base Operating System and Extensions Volume 2.
math.h in AIX 5L Version 5.2 Files Reference.