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The gain G of a certain microwave dish antenna can be expressed as a function of...

The gain G of a certain microwave dish antenna can be expressed as a function of angle by the equation: G(theta) = | sinc (4theta) | for -pi/2<=theta<=pi/2 where θ is measured in radians from the boresite of the dish, and sinc(x) = (sin x)/x. Write a function to calculate the gain function.

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