ON PLANE TRIGONOMETRY; WITH Numerous Collection of Examples, CHIEFLY DESIGNED FOR THE USE OF SCHOOLS AND BEGINNERS. BY R. D. BEASLEY, M. A. FELLOW OF ST JOHN'S COLLEGE, CAMBRIDGE. Cambridge: MACMILLAN AND CO. AND 23, HENRIETTA STREET, COVENT GARDEN, LONDON, 1858. [The right of Translation is reserved.] 183. C. 23. THE following pages are specially intended for use in Schools. In the choice of matter I have been chiefly guided by the requirements of the three days' Examination at Cambridge, with the exception of proportional parts in logarithms, which I have omitted. In one point, I have ventured to deviate from the usual custom. I have denoted angles throughout by the Greek characters, even before the explanation of circular measure. My reasons for doing so were chiefly two; first, that they are much more distinctly and easily written, and it is advisable that a boy should be accustomed in the text to the notation he uses on his paper; secondly, I am thus enabled to insert the algebraical symbols for the angles in the figures, a very great advantage in such propositions as that proved in Art. 27. I have added about 400 examples mainly collected from the Examination Papers of the last ten years, and I have taken great pains to exclude from the body of the work any which might dishearten a beginner by their difficulty. In conclusion, I must express my great obligations to my friend the Rev. R. B. Mayor, of Rugby. Without his kind encouragement I should not have ventured to have offered these pages to the public; and I am indebted to him, not only for many valuable suggestions, but for a careful revision of the whole work. ST JOHN'S COLLEGE, CAMBRIDGE, September, 1858. R. D. BEASLEY. |