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19 Introduction to Trigonometry Worksheet

19 Introduction to Trigonometry Worksheet Concepts: The Trigonometric Functions { The De nitions of sin, cos, and tan Based on the Unit Circle { Evaluating the Basic Trigonometric Functions at Special Angles { The Sign of a Trigonometric Function The ˇ 4 ˇ 4 ˇ 2 or the 45 45 90 Triangle The ˇ 6 ˇ 3 ˇ 2 or the 30 60 90 Triangle