(1-2x)(1+2x) + (1-3x)(1+3x) - (1-4x)(4x+1)
1 -4x² + 1 - 9x² - 1 + 16x² = 1 + 3x²
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1 -4x² + 1 - 9x² - 1 + 16x² = 1 + 3x²