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Question

text  If  end text a greater than 0 text  and  end text L subscript x not stretchy rightwards arrow a end subscript fraction numerator a to the power of x minus x to the power of 4 over denominator x to the power of x minus a to the power of a end fraction equals negative1, then a=

  1. 0
  2. 1
  3. -1
  4. straight infinity

The correct answer is: 1

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