Evaluate the Trigonometric Function of the Given Quadrantal Angle $\cos 9 \pi$

question 221

Multiple Choice

Evaluate the trigonometric function of the given quadrantal angle. If the value is undefined, write "undefined."
- $\cos 9 \pi$

• A) 1
• B) \(- 1\)
• C) 0
• D) undefined

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