Sign of a Function

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Find the intervals or points where the graph of the function shown is positive, negative or zero.
Contributed by: Enrique Zeleny (OptionValue[fallbackPublishDate] {MonthName, Year, Day})
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"Sign of a Function"
http://demonstrations.wolfram.com/SignOfAFunction/
Wolfram Demonstrations Project
Published: OptionValue[fallbackPublishDate] Part[DateValue[OptionValue[fallbackPublishDate], {MonthName, Year, Day}], 3] {MonthName, Year, Day}