which Identity, do we use to factorise x²-y²/100 ? a)a) (a+b)²= a² + b²+ 2ab b)(a-b)² = a + b² - 2ab c)(a-b)³ = a³-3a²b + 3ab²-b³ d)a²-b² = (a - b) (a+b)
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