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Step * of Lemma cosine-exists-ext

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


By

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Latex:
...

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