*Lolly Daskal*

# Example 3 & Example 4 Chapter 3 Trigonometric Functions

**Example 3** Find the value of \sqrt3\cosec20°-\sec20°

**Example 4** If θ lies in the second quadrant, then show that \sqrt{\frac{1-\sin\theta}{1+\sin\theta}}+\sqrt{\frac{1+\sin\theta}{1-\sin\theta}}=-2\sec \theta