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8) Consider the function f(z) given by f(2)=2-2 cos 20z +1. (a) Show that f(z) has zeros at ei, e-i, -eie and -e-it. (b)

8) Consider the function f(z) given by f(2)=2-2 cos 20z +1. (a) Show that f(z) has zeros at ei, e-i, -eie and -e-it. (b) Evaluate the integral, [ord 1 x42 cos 20x +1 dr.

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