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(a + b)² + (a - b)² ⇒ 2(a² + b²)
(a + b)² - (a - b)² ⇒ 4ab
Entonces.
(x + y)² + (x - y)² ⇒ 2(x² + y²)
(m + n)² - (m - n)² ⇒ 4mn