Use *C* for the constant of the first antiderivative and *D* for the constant of the second antiderivative.

Find *f*. (Use *C* for the constant of the first antiderivative and *D* for the constant of the second antiderivative.)

f ''(x) = 6x + sin x

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`f''(x)=6x+sinx=>`

`f'(x)=int(6x+sinx)dx=(6x^2)/2+(-cosx)+C=>`

`f'(x)=3x^2-cosx+C`

`f(x)=int(3x^2-cosx+C)dx=(3x^3)/3-sinx+Cx+D=>`

`f(x)=x^3-sinx+Cx+D`

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