(3x² -2) (3x² -2)
9x⁴ - 6 x² - 6x² + 4
9x⁴ - 12 x² + 4
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(3x² -2) (3x² -2)
9x⁴ - 6 x² - 6x² + 4
9x⁴ - 12 x² + 4