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Find $\int (x+3)^2 \ dx$.

A

$6x^2 + 9x + x^3 + C$

B

$\frac{x^3+3}{3}$

C

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

D

$\frac{x^3}{3}+x^2+9x+C$

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