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Step * of Lemma cosine-rminus

∀x:ℝ. (cosine(-(x)) = cosine(x))
BY
{ (Auto THEN (InstLemma `cosine-is-limit` [⌜x⌝]⋅ THENA Auto) THEN (InstLemma `cosine-is-limit` [⌜-(x)⌝]⋅ THENA Auto)) }

1
1. x : ℝ
2. Σi.-1^i * (x^2 * i)/(2 * i)! = cosine(x)
3. Σi.-1^i * (-(x)^2 * i)/(2 * i)! = cosine(-(x))
⊢ cosine(-(x)) = cosine(x)

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Latex:

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Latex:
\mforall{}x:\mBbbR{}.  (cosine(-(x))  =  cosine(x))


By

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Latex:
(Auto
  THEN  (InstLemma  `cosine-is-limit`  [\mkleeneopen{}x\mkleeneclose{}]\mcdot{}  THENA  Auto)
  THEN  (InstLemma  `cosine-is-limit`  [\mkleeneopen{}-(x)\mkleeneclose{}]\mcdot{}  THENA  Auto))

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