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2 - partiendo de cada una de las expresiones de la izquierda, usar identidades para obtener la expresión de la derecha

a) (x + 3) (x + 3) - (x² + x + 6) -------------------------→ 5x + 3

b) (x² - 1) - (x - 1)² -----------------------------------------→ 2 (x - 1)

c) (x + 2) (x + 6) - (x + 2) (x + 5) ----------------------→
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