Trigonometric Functions - Problem Solving Approach by A. Panchishkin, E. Shavgulidze

LINK ORIGINAL EN LA WEB
https://archive.org/details/TrigonometricFunctions-ProblemSolvingApproach

 Trigonometric Functions - Problem Solving Approach by A. Panchishkin, E. Shavgulidze

This study aid is to help the student to master the basic techniques of solving difficult problems in trigonometry. The book contains theoretical material, many worked competition problems, and some problems to be solved independently (the answers being at end of the book.) Intended for high-school and precollege students.

LINK
https://archive.org/download/TrigonometricFunctions-ProblemSolvingApproach/Trigonometric-Functions-Problem-Solving-Approach.pdf