| C06HBF | Discrete cosine transform |
| C06HDF | Discrete quarter-wave cosine transform |
| C06RBF | Discrete cosine transform (easy-to-use) |
| C06RDF | Discrete quarter-wave cosine transform (easy-to-use) |
| F06BCF | Recover cosine and sine from given real tangent |
| F06CAF | Generate complex plane rotation, storing tangent, real cosine |
| F06CCF | Recover cosine and sine from given complex tangent, real cosine |
| F06CCF | Recover cosine and sine from given complex tangent, real cosine |
| F06CDF | Recover cosine and sine from given complex tangent, real sine |
| F06FAF | Compute cosine of angle between two real vectors |
| F06TXF | Apply sequence of plane rotations, complex rectangular matrix, real cosine and complex sine |
| F06TYF | Apply sequence of plane rotations, complex rectangular matrix, complex cosine and real sine |
| F06VXF | Apply sequence of plane rotations, complex rectangular matrix, real cosine and sine |
| S13ACF | Cosine integral Ci(x) |