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

question 203

Multiple Choice

Find the exact value of the expression if θ = 30°. Do not use a calculator.
- $f ( \theta ) = \cos \theta \quad$ Find $[ f ( \theta ) ] ^ { 2 }$ .

• A) \(\frac { \sqrt { 3 } } { 2 }\)
• B) \(\sqrt { 3 }\)
• C) \(\frac { 3 } { 4 }\)
• D) \(\frac { 1 } { 4 }\)