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Trigonometry, as part of Physical Chemistry, is the study of the relationships between the angles and sides of triangles, with applications in various scientific fields. It provides tools for understanding periodic phenomena, such as sound and light waves, which are fundamental to physical chemistry. The subject involves concepts like sine, cosine, tangent, and their respective inverse functions, as well as identities, equations, and inequalities involving these trigonometric functions. These concepts find extensive use in solving problems related to wave motion, quantum mechanics, and statistical mechanics, thus making trigonometry an integral part of Physical Chemistry within the broader context of Science and Mathematics.