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Step * 4 of Lemma rcos-strictly-decreasing


1. iproper([r0, π])
2. x : {x:ℝ| x ∈ (r0, π)} 
⊢ -(rsin(x)) < r0
BY
{ (nRAdd ⌜rsin(x)⌝ 0⋅ THEN BLemma `rsin-positive` THEN Auto) }

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Latex:

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Latex:

1.  iproper([r0,  \mpi{}])
2.  x  :  \{x:\mBbbR{}|  x  \mmember{}  (r0,  \mpi{})\} 
\mvdash{}  -(rsin(x))  <  r0


By

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Latex:
(nRAdd  \mkleeneopen{}rsin(x)\mkleeneclose{}  0\mcdot{}  THEN  BLemma  `rsin-positive`  THEN  Auto)

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