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This chapter covers some basic features of trigonometry such as angular measure, trigonometric ratios, inverse ratios, trigonometric identities and various rules, with which the reader should be familiar. The word “trigonometry” divides into three parts: “tri”, “gon”, “metry”, which means the measurement of three-sided polygons, i.e. triangles. It is an ancient subject and is used across all branches of mathematics.
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- Chapter 5