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(4 - 2a)^4 = (4-2)(4-2)(4-2)(4-2) = 8a³ - 16a² - 96a + 64 (4-2a)
= 32a³ - 16a^4 -64a² + 32a³ - 384a +192a² + 256 -128a
= -16a^4 + 64a³ +128a² -512a + 256
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