please help to express into (a+b)²/a
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(a + b)² and (a - b)² are two famous identities =>
(a + b)² - (a - b)²
= a² + 2ab + b² - (a² - 2ab + b²)
= a² + 2ab + b² - a² + 2ab - b²
= 4ab
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