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Step * of Lemma rcos-rminus

∀x:ℝ. (rcos(-(x)) = rcos(x))
BY
{ (RWO "rcos-is-cosine" 0 THEN Auto) }

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Latex:

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


By

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Latex:
(RWO  "rcos-is-cosine"  0  THEN  Auto)

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