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Step * 1 of Lemma rcos-rabs


1. x : ℝ
2. x < r0
⊢ rcos(|x|) = rcos(x)
BY
{ (RWO "rabs-of-nonpos" 0 THEN Auto) }

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Latex:

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Latex:

1.  x  :  \mBbbR{}
2.  x  <  r0
\mvdash{}  rcos(|x|)  =  rcos(x)


By

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Latex:
(RWO  "rabs-of-nonpos"  0  THEN  Auto)

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