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# Chapter 09: Fundamentals of Trigonometry

Notes (Solutions) of Chapter 09: Fundamentals of Trigonometry, Text Book of Algebra and Trigonometry Class XI (Mathematics FSc Part 1 or HSSC-I), Punjab Text Book Board, Lahore.

### Contents & summary

- Introduction
- Units of Measures of Angles
- Sexagesimal System
- Conversion from $D^\circ M'S''$ to the decimal form and vice versa
- Circular System (Radians)

- Relation between the Length of an arc of a Circle and the Circular measure of its Central angle
- Conversion of Radian into Degree and vice versa
- Exercise 9.1

- General Angle (Coterminal Angle)
- Angle in the Standard Position
- Trigonometric Function
- Trigonometric Function of any Angle
- Fundamental Identities
- Signs of the Trigonometric Function
- Exercise 9.2

- The Values of Trigonometric Functions of acute angles $45^\circ , 30^\circ , 60^\circ$
- The Values of Trigonometric Functions of acute angles $0^\circ , 90^\circ , 180^\circ , 270^\circ , 360^\circ$
- Exercise 9.3

- Domains of Trigonometric Functions and of Fundamental Identities
- Exercise 9.4

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