Question: This must be a bug in integration

I beleave this must be wrong - plea

NULL

int(int(x^2+1, x), x)

(1/12)*(x^2+3)^2``

(1)

int(x^2+1, x)

(1/3)*x^3+x

(2)

int((1/3)*x^3+x, x)

(1/12)*(x^2+3)^2

(3)

NULL

NULL


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