*Nathaniel Hawthorne*

# Example 5 & Example 6 Chapter 3 Trigonometric Functions

**Example 5** Find the value of tan 9° – tan 27° – tan 63° + tan 81°

**Example 6** Prove that \frac{\sec8\theta-1}{\sec4\theta-1}=\frac{\tan8\theta}{\tan2\theta}

Skip to content
# Example 5 6 Exemplar Problems Chapter 3 Class 11

# Example 5 & Example 6 Chapter 3 Trigonometric Functions

Posted on by Ashish Kumar

*Nathaniel Hawthorne*

**Example 5** Find the value of tan 9° – tan 27° – tan 63° + tan 81°

**Example 6** Prove that \frac{\sec8\theta-1}{\sec4\theta-1}=\frac{\tan8\theta}{\tan2\theta}