Arihant Plane Trigonometry Part 1 by SL Loney

As the name suggests, the ‘Classic Text Series’ is the only of its kind selection of classic pieces of work that started off as bestseller and continues to be the bestseller even today.
The book has been divided into 21 chapters namely Measurement of angles; Sexagesimal and Centesimal Measure Circular or Radian, Measure, Trigonometrical ratios for angles less than a right angle, Simple problems in Heights & Distances, Applications of algebraic signs to Trigonometry tracing the changes in the ratios, Trigonometrical ratios of angles of any size & sign, General expressions for all angles having an given trigonometrical ratio, Trigonometrical ratios of the sum & difference of two angles product formulae, Trigonometrical ratios of multiple & submultiple of angles, Identities & trigonometrical equations, Logarithms, Tables of Logarithms, The Principle of Proportional parts, Relations between the Side & Trigonometrical ratios of the Angles of a triangle, Solution of triangles, given two sides & the included angle, ambiguous case, Heights & Distances, Properties of a triangle, Quadrilaterlas, Regular Polygons, Inverse circular functions, Summation of some simple trigonometrical series, Elimination and Projections, each covering various concepts of Plane Trigonometry.