Calculate the nonnegative arc hyperbolic cosine of the input argument x (measured in radians).
- Returns:
- Result will be in the interval [0, +
].
- acoshf(1) returns 0.
- acoshf(
x) returns NaN for x in the interval [
, 1).
- Note:
- For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.