A. 7 - 2√10 / 7 - 2√10
ExplanationUsing (a - b)² gives 5 + 2 - 2√10 = 7 - 2√10.
(a - b)² लगाने पर 5 + 2 - 2√10 = 7 - 2√10 मिलता है।
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