factorise (x-1)² + (x + 1)²
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( x - 1 ) ² + ( x + 1 ) ²
x² - 2x + 1 + ( x + 1 ) ²
x² - 2x + 1 + x² + 2x + 1
2x² - 2x + 1 + 2x + 1
2x² + 1 + 1
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