You will learn following

1. Importance of right angled triangle

2. Angles and their relations

3. Quadrants and angles in various quadrants

4. Introduction of various trigonometric ratios

5. Finding values of trigonometric ratios with basic angles

6. Finding values of trigonometric ratios of angles in other quadrants

7. proving three basic identities

8. Questions solving tricks of three basic identities

   This will help you in solving calculus problems. This will help you to apply basic identities in trigonometry.