| C06RBF
| Discrete cosine transform (easy-to-use) |
| C06RDF
| Discrete quarter-wave cosine transform (easy-to-use) |
| F01EKF
| Exponential, sine, cosine, sinh or cosh of a real matrix (Schur–Parlett algorithm) |
| F01FKF
| Exponential, sine, cosine, sinh or cosh of a complex matrix (Schur–Parlett algorithm) |
| F01JAF
| Condition number for the exponential, logarithm, sine, cosine, sinh or cosh of a real matrix |
| F01KAF
| Condition number for the exponential, logarithm, sine, cosine, sinh or cosh of a complex matrix |
| 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 |
| 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 |