Evaluate ∫3x2 dx\displaystyle\int 3x^2\, dx∫3x2dx.
x3+Cx^3 + Cx3+C
6x+C6x + C6x+C
3x3+C3x^3 + C3x3+C
x33+C\dfrac{x^3}{3} + C3x3+C