- Trigonometric ratios of 45 degree
- Problem 1: Trigonometric ratios of 45 degree
- Trigonometric ratios of 30 degree and 60 degree
- Problem 1: Trigonometric ratios of 30 degree and 60 degree
- Problem 2: Trigonometric ratios of 30 degree and 60 degree

- Trigonometric Ratios of an Complementary Angles
- Problem 1: Trigonometric Ratios of an Complementary Angles

- Proof of Fundamental Trigonometric Identity
- Problem 1: Proof of Fundamental Trigonometric Identity
- More on Fundamental Trigonometric Identity
- Problem 2: More on Fundamental Trigonometric Identity
- Problem 3: More on Fundamental Trigonometric Identity
- Problem 4: More on Fundamental Trigonometric Identity
- Problem 1: More on Fundamental Trigonometric Identity

- When measures of one side and one angle are given
- Problem 1: When measures of one side and one angle are given
- when measures of hypotenuse and one Acute angle are given
- Problem 1: when measures of hypotenuse and one angle are given
- When measures of two sides are given
- Problem 1: When measures of two sides are given
- When measures of hypotenuse and one side are given
- Problem 1: When measures of hypotenuse and one side are given

- Concept of Angle of Elevation & Depression
- Problem 1: Concept of Angle of Elevation & Depression
- when one Side & Angle of Elevation are Given
- Problem 1: when one Side & Angle of Elevation are Given
- when One Side & Angle of Depression are Given
- Problem 1: when One Side & Angle of Depression are Given
- when Hypotenuse & Angle of Elevation are Given
- Problem 1: when Hypotenuse & Angle of Elevation are Given
- when Given Sides-Angle of Elevation-Depression
- Problem 1: when Given Sides-Angle of Elevation-Depression