If , which of the following expressions is equivalent to ?

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If <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03265.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>a</m:mi><m:mo>></m:mo><m:mn>2</m:mn></m:mrow></m:math>-->, which of the following expressions is equivalent to <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03266.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mfrac><m:mn>1</m:mn><m:mrow><m:mfrac><m:mn>1</m:mn><m:mrow><m:mi>a</m:mi><m:mo>+</m:mo><m:mn>2</m:mn></m:mrow></m:mfrac><m:mo>-</m:mo><m:mfrac><m:mn>1</m:mn><m:mrow><m:mi>a</m:mi><m:mo>-</m:mo><m:mn>2</m:mn></m:mrow></m:mfrac></m:mrow></m:mfrac></m:mrow></m:math>-->?