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Chapter 09: Fundamentals of Trigonometry
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* Exercise 9.2 * The Values of Trigonometric Functions of acute angles $45^\circ , 30^\circ , 60^\circ$ * The Values of Trigonometric Functions of acute angles $0^\circ , 90^\circ , 180^\circ ,... $ * Exercise 9.3 * Domains of Trigonometric Functions and of Fundamental Identities * Exercise 9.4