5.5.43 I think the answer given is wrong! differentiating it does not produce f '.? I know cos(x2) does not because it was mentioned earlier, but still do I have to prove it? I tried a bit and failed. 5.5.18, am I supposed to prove that sin (x2) has not antider.5.5.27 (and similar), does not the answer depend on x>17 and x, I found a better proof in notes 3, but I still want to see what I do not like about the proof in the book.It's not that any of the steps in Theorem 2a are technically incorrect, but they are starting off with the constant c on the outside of the integral?!?! WTF? , Theorem 2 (a), is that really a proof? We have proven that the derivatives of both sides are equal, does that mean the antiderivatives are? why? Wow, no that does NOT appear to be a proof.
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