1. The tables of logarithms of sines, secants, and tangents were also required for the purposes of navigation.

2. ‘The first tabulates logarithms of the sine, cosine, tangent and Cotangent functions at 1 intervals and shows how to solve triangles using logarithmic functions.’ ‘I can't tell the difference between radians, tangents, Cotangents, secants, etc.’ ‘Since we want the Cotangent, just take the reciprocal to solve.’

3. ‘The first tabulates logarithms of the sine, cosine, tangent and Cotangent functions at 1 intervals and shows how to solve triangles using logarithmic functions.’ ‘I can't tell the difference between radians, tangents, Cotangents, secants, etc.’ ‘Since we want the Cotangent, just take the reciprocal to solve.’