The function f(x) = r cos(r) +1 sin(x) is (a) even (b) odd (c) neither even nor odd If f is a periodic function of period 6, and f(z) = 3r – 4, 0<1< 6, then f(57) is (a) –1. (b) 2. (c) 5. (d) 8. (e) None of the above

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