Which of the following is equivalent to this expression? Note that .

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Which of the following is equivalent to this expression? Note that <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03486.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:msup><m:mrow><m:mi>i</m:mi></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup><m:mo>=</m:mo><m:mo>-</m:mo><m:mn>1</m:mn></m:mrow></m:math>-->.<br><img alt='images' src='https://www.fatskills.com/images2/SAT/eq03487.png'/><!--<m:math display='block' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mfrac><m:mrow><m:mn>2</m:mn><m:mo>+</m:mo><m:mn>2</m:mn><m:mi>i</m:mi></m:mrow><m:mrow><m:mn>2</m:mn><m:mo>-</m:mo><m:mn>2</m:mn><m:mi>i</m:mi></m:mrow></m:mfrac></m:mrow></m:math>-->