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Solve the Problem f(θ)=cos⁡θf ( \theta ) = \cos \theta And f(a)=−112f ( a ) = - \frac { 1 } { 12 }

Question 212

Multiple Choice

Solve the problem.
-If f(θ) =cos⁡θf ( \theta ) = \cos \theta and f(a) =−112f ( a ) = - \frac { 1 } { 12 } , find the exact value of f(a) +f(a−2π) +f(a+4π) f ( a ) + f ( a - 2 \pi ) + f ( a + 4 \pi )


A) −36- 36
B) −12- 12
C) −112- \frac { 1 } { 12 }
D) −14- \frac { 1 } { 4 }

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