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If (a + b)2 = 36, and ab = 4, then a2 + b2 =

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If (<em>a</em> + <em>b</em>)<sup>2</sup> = 36, and <em>ab</em> = 4, then <em>a</em><sup>2</sup> + <em>b</em><sup>2</sup> =






 
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