Question

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Answer 1

Explicação passo-a-passo:

$1 + \frac{x}{3} - \frac{x}{3} - \frac{ {x}^{2} }{9} = 1 - \frac{ {x}^{2} }{9}$

$\frac{1}{9} {x}^{4} + \frac{1}{3} {x}^{2} {y}^{2} - \frac{1}{3} {x}^{2} {y}^{2} - {y}^{4} \\ = \frac{1}{9} {x}^{4} - {y}^{4}$