 Trigonometry is a greek word where 'trignon' means ''triangle'' and 'metron' means ''measure''.
A trigonometry is a branch of mathematics which help us to understands the relationship involving the length and angles of triangles. There are six functions of an angle commonly used in trigonometry, the names and abbreviation are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc).
In this chapter we will study the following topics-
-trigonometric ratios
-trigonometric ratios of some specific angles,
-trigonometric ratios of complementary angles,
-trigonometric identities

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### Lecture 15: Trigonometry Part- 15

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Trigonometry is a greek word where 'trignon' means ''triangle'' and 'metron' means ''measure''.
A trigonometry is a branch of mathematics which help us to understands the relationship involving the length and angles of triangles. This chapter we will concentrate on the heights and distance of trigonometry.

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