naginterfaces.library.specfun.arccos¶
- naginterfaces.library.specfun.arccos(x)[source]¶
arccos
returns the value of the inverse circular cosine, ; the result is in the principal range .For full information please refer to the NAG Library document for s09ab
https://support.nag.com/numeric/nl/nagdoc_30.2/flhtml/s/s09abf.html
- Parameters
- xfloat
The argument of the function.
- Returns
- acxfloat
The value of the inverse circular cosine, .
- Raises
- NagValueError
- (errno )
On entry, .
Constraint: .
- Notes
No equivalent traditional C interface for this routine exists in the NAG Library.
arccos
calculates an approximate value for the inverse circular cosine, . It is based on the Chebyshev expansionwhere .
For .
For .
For .
For is undefined and the function fails.
- References
NIST Digital Library of Mathematical Functions