You need to remember that differentiating the primitive function `F(x)` yields `f(x)` , hence, you need to test if `F'(x) = f(x)` , such that:

`F'(x) = (ln(x^2002+1))'`

You need to use the chain rule to evaluate the derivative of the function, such that:

`F'(x) = 1/(x^2002+1)*(x^2002+1)'`

`F'(x) = 1/(x^2002+1)*(2002x^(2002-1))`

`F'(x) = (2002x^2001)/(x^2002+1)`

Comparing the expression of derivative `F'(x)` with the equation of the function `f(x)` yields that they coincide.

**Hence, checking if the function `F(x)` is the primitive of `f(x)` , yields that `F'(x) = f(x),` thus, the statement holds.**

**Further Reading**

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