#### Trigonometry

After completion of this chapter, students will be able to:

- know about various trigonometric ratios, trigonometric identities and equations.
- solve problems related to trigonometric ratios, trigonometric identities and equations.
- solve problems of height and distance.

#### Notes

#### Trigonometric Ratios of Compound Angles

Let A and B two angles. Then their sum A + B or the difference A - B is called a compound angle. The sum or difference of any two or more than two angles is called a compound angle.

#### Trigonometric Ratios of Multiple Angles

If A is an angle, then 2A, 3A, 4A, 5A, etc. are called multiple angles of A.

#### Trigonometric Ratios of Sub Multiple Angles

If A is an angle, then \(\frac{A}{2}\), \(\frac{A}{3}\), \(\frac{A}{4}\) etc. are called sub - multiple angles of A.