A treatise on plane trigonometry by E. W. Hobson. Hobson, Ernest William, 1856-1933. Greenhill, G. (George), Sir, 1847-1927. fmo NNC Plane trigonometry. Series, Infinite. Exponential functions. QA533 .H68 1891 514.5 HOT Rare Book copy: [Sir] A[lfred] G[eorge] Greenhill's copy, with his autograph and manuscript note, "From the Syndics (and the Author)." NNC Cambridge : University Press, c1891. c1891. 1891 Text xv, 356 p. ; eng Also issued online. Also issued online.