Trigonometry in 2014

Algebra and Trigonometry by Nation, Richard, Aufmann, Richard

NOW 2 kNOW Algebra 1 by D'Alberto, T. G.

«Conformément Aux Observations d'Hipparque» Le Papyrus Fouad Inv. 267 a by Tihon, A., Fournet, J. -L

Elements of Geometry: Containing the First Six Books of Euclid by Playfair, John, Euclid

NOW 2 kNOW Algebra 2 & Trigonometry by D'Alberto, T. G.