Complete the Identity $\frac { \cos ( 3 \theta ) - \cos ( 9 \theta ) } { \cos ( 3 \theta ) + \cos ( 9 \theta ) } = ?$

question 149

Multiple Choice

Complete the identity.
- $\frac { \cos ( 3 \theta ) - \cos ( 9 \theta ) } { \cos ( 3 \theta ) + \cos ( 9 \theta ) } = ?$

• A) 0
• B) \(\tan ( 3 \theta ) \tan ( 6 \theta )\)
• C) \(\cot ( 6 \theta )\)
• D) \(- \tan ( 6 \theta )\)

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