(c² + 1)² - 4c²
(c² + 1 - 2c) × (c² + 1 + 2c)
(c² - 2c + 1) × (c² + 2c + 1)
(c - 1)² × (c + 1)²
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(c² + 1)² - 4c²
(c² + 1 - 2c) × (c² + 1 + 2c)
(c² - 2c + 1) × (c² + 2c + 1)
(c - 1)² × (c + 1)²