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Trigonometry is a branch of mathematics concerned with the study of triangles and their relationships to angles. It involves understanding concepts such as sine, cosine, tangent, and their applications in solving problems related to angles and lengths. In the context of secondary education, trigonometry is typically taught as part of the high school curriculum and builds upon foundational knowledge of algebra and geometry. Historically, trigonometry has been used in various fields such as astronomy, navigation, and architecture, making it an important subject in world history. Trigonometry has played a crucial role in the development of mathematics and science, enabling advancements in technology and engineering. As a discipline, trigonometry continues to be relevant and applicable in modern times, with applications ranging from computer graphics to physics and engineering.