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f space left parenthesis x right parenthesis equals t a n to the power of negative 1 end exponent invisible function application x minus x is decreasing in

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  1. left parenthesis 0 comma infinity right parenthesis only    
  2. left parenthesis negative infinity comma infinity right parenthesis    
  3. left parenthesis negative infinity comma 0 right parenthesis only    
  4. left parenthesis negative 1 , 1 right parenthesis only    

    Answer:The correct answer is: left parenthesis negative infinity comma infinity right parenthesis

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