| The scales provide the tangent or cotangent of the meridian altitude. |
| The first tabulates logarithms of the sine, cosine, tangent and cotangent functions at 1 intervals and shows how to solve triangles using logarithmic functions. |
| It will output the corresponding angle of a given cotangent value. |
| The tangent and cotangent came via a different route from the chord approach of the sine. |
| The sixth edition adds a section on graphing the tangent, cotangent, secant, and cosecant functions. |
| Since we want the cotangent, just take the reciprocal to solve. |
