Find the Exact Value of the Expression If θ = $f ( \theta ) = \cos \theta \quad$

question 158

Multiple Choice

Find the exact value of the expression if θ = 30°. Do not use a calculator.
- $f ( \theta ) = \cos \theta \quad$ Find $11 f ( \theta )$ .

• A) \(\frac { 11 \sqrt { 3 } } { 2 }\)
• B) \(- \frac { \sqrt { 3 } } { 2 }\)
• C) \(\frac { 11 } { 2 }\)
• D) \(- \frac { 1 } { 2 }\)

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