| a02dkc | Complex cosine |
| c06hbc | Discrete cosine transform |
| c06hdc | Discrete quarter-wave cosine transform |
| d01anc | One-dimensional adaptive quadrature, finite interval, sine or cosine weight functions |
| d01asc | One-dimensional adaptive quadrature, semi-infinite interval, sine or cosine weight function |
| d01snc | One-dimensional adaptive quadrature, finite interval, sine or cosine weight functions, thread-safe |
| d01ssc | One-dimensional adaptive quadrature, semi-infinite interval, sine or cosine weight function, thread-safe |
| s10acc | Hyperbolic cosine, cosh x |
| s11acc | Inverse hyperbolic cosine, arccosh x |
| s13acc | Cosine integral Ci(x) |