Question: A rectangular billboard 5 feet in height stands in a field so that its bottom is 10 feet above the ground. A nearsighted cow with

A rectangular billboard 5 feet in height stands in a field so that its bottom is 10 feet above the ground. A nearsighted cow with eye level at 4 feet above the ground stands x feet from the billboard. Express ?, the vertical angle subtended by the billboard at her eye, in terms of x. Then find the distance x₀the cow must stand from the billboard to maximize ?.

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