# Introduction to Trigonometry - NCERT Class 10 Maths

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At the beginning of the chapter 8, it is mentioned that trigonometry is the study of relationships between the sides and angles of a triangle. Other concepts covered are the trigonometric ratios of the angle and trigonometric identities. Specifically, some of the trigonometric identities explained in this chapter are - sine, cosine, tangent, cosecant, secant and cotangent. For the second exercise, trigonometric ratios of some specific angles are presented. Next, for the third exercise, the important concept of trigonometric ratios for complementary angles is taken up. Finally, the chapter covers different trigonometric identities and their applications.

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## Exercise 8.4

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