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Step * 1 of Lemma rcos-nonneg


1. x : {x:ℝ| x ∈ [-(π/2), π/2]} 
2. r0 < x
⊢ r0 ≤ rcos(x)
BY
{ (BLemma `rcos-nonneg-upto-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  \mleq{}  rcos(x)


By

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Latex:
(BLemma  `rcos-nonneg-upto-half-pi`  THEN  Auto)

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