(a + 2) · (a² - 2a + a²) =
a · (a² - 2a + a²) + 2 · (a² - 2a + a²)
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(a + 2) · (a² - 2a + a²) =
a · (a² - 2a + a²) + 2 · (a² - 2a + a²)