simplify (x+3) cube + (x-3) cube
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(x+3)³ + (x-3)³
= (x+3+x-3)[(x+3)² -(x+3)(x-3) + (x-3)²]
= (2x+0)(x²+9+6x-x²+9+x²+9-6x)
= 2x(27+x²)
= 54x+2x³
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