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For the ellipse fraction numerator x to the power of 2 end exponent over denominator 2 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 1 end fraction equals 1 comma the foci are

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  1. open parentheses plus-or-minus fraction numerator 1 over denominator 2 end fraction comma 0 close parentheses.    
  2. open parentheses plus-or-minus fraction numerator 1 over denominator square root of 2 end fraction comma 0 close parentheses    
  3. ( ±1, 0)    
  4. (0, ± 1)    

    Answer:The correct answer is: ( ±1, 0)

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