Simplify (x+3)^2 - (x-3)^2
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(x+3)² - (x-3)²
=x²+(3)²+(2)(x)(3) - [ x²+(3)²-(2)(x)(3)]
=x²+9+6x- [x²+9-6x]
=x²+9+6x-x²-9+6x
=12x
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