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      <p>The full expansion above looks in 64 bits.The function takes it in 32 bit Smath, butNOT the derivative. CONCLUSIVELY: it lookslike a derivative insuffisance ... that explains why incremental works, because ittakes 'f'  </p>
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        <p>can't explain refusal  [see above]</p>
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        <p>above max is Smath error message</p>
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