Simplify (p + q )² - (p - q)²
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2(p2 + q2) is your answer
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=> ( p + q )² - ( p - q)²
=> ( p² + 2p²q² + q² ) - ( p² - 2p²q² + q² )
=> p² + 2p²q² + q² - p² + 2p²q² - q²
=> 4p²q²
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