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Real life applications of trigonometry Trigonometry simply means calculations with triangles (that's where the tri comes from). Trigonometry is a system that helps us to work out missing sides or angles in a triangle. I do have several pieces of advice that I have summarised below but beware that it might not be. trigonometry 1 2 the unit circle and special triangles 1 3 calculator use 1 4 vectors analytic trigonometry practice test analytic trigonometry answer key chapter 2: parent trigonometric functions (pdf). This is the Aptitude Questions & Answers section on & Trigonometry& with explanation for various interview, competitive examination and entrance test. Let's Practice: What is the exact value of sin(105º)? We can use a sum angle formula noticing that 105º = 45º + 60º. 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