Question: 4 If f(x) = cos x and f(a): find the exact value of the following. (i) f(-a), (ii) %3D %3D f(a) + f(a +

4 If f(x) = cos x and f(a): find the exact value 

4 If f(x) = cos x and f(a): find the exact value of the following. (i) f(-a), (ii) %3D %3D f(a) + f(a + 2) + f(a + 47)

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