Plane Trigonometry: Part 1  (English, Paperback, Loney S. L.)

1. Measurement of Angles, Sexagesimal and Centesimal Measure      
Circular or Radian, Measure             
2. Trigonometrical Ratios for Angles Less than a Right Angle       
Values for Angles of 45°, 30°, 60°, 0° and 90°                     
3. Simple problems in Heights and Distances             
4. Applications of algebraic Signs to Trigonometry          
Tracing the Changes in the Ratios           
5. Trigonometrical Ratios of Angles of Any Size and Sign
Ratios for — q, 90°— q, 90° + q                
6. General Expressions for All Angles having a Given Trigonometrical Ratio             
7. Trigonometrical Ratios of the Sum and Difference of Two Angles                 
Product Formulae                                                                            
8. Trigonometrical Ratios of Multiple and Sub multiple of Angles                   
Explanation of Ambiguities                                                                 
Angles of 18°, 36° and 9°                                                                       
9. Identities and Trigonometrical Equations             
10. Logarithms                                                                                                       
Tables of Logarithms                                                                                       
11. The Principle of Proportional Parts                                                               
12. Relations Between the Side and Trigonometrical Ratios of the Angles of a Triangle
13. Solution of Triangles
Given Two Sides and the Included Angle                           
Ambiguous Case                                                                                           
14. Heights and Distances                                                                                          
15. Properties of a Triangle                                                                         
The Circles Connected with a Given Triangle                                             
Orthocentre and Pedal Triangle
Centroid and Medians                                                                                  
16. Quadrilaterals                                
Regular Polygons                                                                                      
17. Trigonometrical Ratios of Sin q < q < tan q Small Angles   
Area of a Circle                                                            
Dip of the Horizon                                           
18. Inverse Circular Functions                                 
19. Summation of Some Simple Trigonometrical Series                               
20. Elimination                                                                                
21. Projections
                                                                                    
Miscellaneous Examples                                                                            
Answers                                                                 
Five-figure Logarithmic and Trigonometrical Tables             
Attachment