Question: Formula 4 is valid only when f(x) 0. Show that when f(x) is not necessarily positive, the formula for surface area becomes 27| f(x)

Formula 4 is valid only when f(x) ‰¥ 0. Show that when f(x) is not necessarily positive, the formula for surface area becomes
27| f(x) |V1 + [f'(x)]² dx

27| f(x) |V1 + [f'(x)] dx

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