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Step * of Lemma sine-exists-ext

∀x:ℝ. ∃a:ℝ. Σi.-1^i * (x^(2 * i) + 1)/((2 * i) + 1)! = a
BY
{ ... }

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Latex:

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Latex:
\mforall{}x:\mBbbR{}.  \mexists{}a:\mBbbR{}.  \mSigma{}i.-1\^{}i  *  (x\^{}(2  *  i)  +  1)/((2  *  i)  +  1)!  =  a


By

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Latex:
...

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