Uh Uh! It looks like something you learned in the past about the natural logarithm is breaking through here! The answer has nothing to do with the natural logarithm (it hasn't even come up in the tutorials thus far). What is true about the natural logarithm is that ln |x| is the antiderivative of 1/x. Moreover, it is not true that ln|x3| is the antiderivative of 1/x3. Back to the drawing board...
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