Why can the function 
not be the harmonic function of a real signal?
What will be an ideal response?
Because for any real signal 
and that is not true of this function.
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Steel, stainless steel, cast iron, and wrought iron are the important ferrous metals. Which was discovered first, and which other ferrous metal followed it?
What will be an ideal response?
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Rosa has to obtain housing for 29 migrant workers. She can only house four workers per room. How many rooms does she need?
What will be an ideal response?
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All employees at all job sites do not need to be trained in fire protection procedures and response.