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(x + y)3 + (x - y)3 = (x3 + 3x2y + 3xy2 + y3) + (x3 - 3x2y + 3xy2 - y3)

= 2x3 + 6xy2 = 2x*(x2 + 3y2)

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Q: What is the answer to x plus y to 3rd power plus x minus y to 3rd power?
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