Plane Trigonometry

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. As Trigonometry consists largely of formulae and the applications thereof, I have prefixed (on pages x to xvi) a list of the principal formula which the student Should commit to memory. These more important formu lee are distinguished in the text by the use of thick type. Other formula are subsidiary and of less importance.