Solve the Problem $f ( \theta ) = \cos \theta$ And $f ( a ) = - \frac { 1 } { 12 }$

question 68

Multiple Choice

Solve the problem.
-If $f ( \theta ) = \cos \theta$ and $f ( a ) = - \frac { 1 } { 12 }$ , find the exact value of $f ( a ) + f ( a - 2 \pi ) + f ( a + 4 \pi )$ .

• A) \(- 36\)
• B) \(- 12\)
• C) \(- \frac { 1 } { 12 }\)
• D) \(- \frac { 1 } { 4 }\)

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