Question: In Problems 113118, use the periodic and even-odd properties. If f () = cos and f (a) = 1/4, find the exact value of: (a)

In Problems 113–118, use the periodic and even-odd properties.


If f (θ) = cosθ and f (a) = 1/4, find the exact value of:(a) f(-a) (b) f(a) + f(a + 2) + f(a - 2)

(a) f(-a) (b) f(a) + f(a + 2) + f(a - 2)

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