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Indefinite Integral of a Sum

APCALC-QLQBWU

Find the indefinite integral:

$$\int { \left( \cos(x)+3{ x }^{ 2 } \right) } dx$$

A

$\sin(x)+x^{3}+C$

B

$\sin(x)+6x+C$

C

$-\sin(x)+x^{3}+C$

D

$-\sin(x)+6x+C$