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Step * 1 of Lemma rcos-positive


1. x : {x:ℝ| x ∈ (-(π/2), π/2)} 
2. r0 < x
⊢ r0 < rcos(x)
BY
{ (BLemma `rcos-positive-before-half-pi` THEN Auto) }

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Latex:

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Latex:

1.  x  :  \{x:\mBbbR{}|  x  \mmember{}  (-(\mpi{}/2),  \mpi{}/2)\} 
2.  r0  <  x
\mvdash{}  r0  <  rcos(x)


By

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Latex:
(BLemma  `rcos-positive-before-half-pi`  THEN  Auto)

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