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Step * of Lemma cosine_functionality

No Annotations
∀[x,y:ℝ].  cosine(x) = cosine(y) supposing x = y
BY
{ (Auto THEN (InstLemma `cosine-is-limit` [⌜x⌝]⋅ THENA Auto) THEN (InstLemma `cosine-is-limit` [⌜y⌝]⋅ THENA Auto)) }

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

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Latex:

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Latex:
No  Annotations
\mforall{}[x,y:\mBbbR{}].    cosine(x)  =  cosine(y)  supposing  x  =  y


By

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

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