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Trigonometry deals with the relationships between angles and side lengths in triangles, making it an essential part of calculus and mathematics as a whole. It introduces concepts such as sine, cosine, tangent, and their respective inverse functions, which are used to model periodic phenomena in various scientific fields, including physics and engineering. In the hierarchy of Science/Mathematics/Calculus, trigonometry can be seen as a toolbox of techniques and formulas that allow for the analysis and solution of problems within calculus and beyond, ultimately contributing to our understanding of the world through a mathematical lens.