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Solve the Problem $f ( \theta ) = \cos \theta$ And $f ( a ) = - \frac { 1 } { 4 }$

Question 332

Multiple Choice

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

A) $- \frac { 3 } { 4 }$
B) $\frac { 3 } { 4 }$
C) $\frac { 1 } { 4 }$
D) $- \frac { 1 } { 4 }$

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