Step
*
3
1
of Lemma
rcos-strictly-decreasing
1. iproper([r0, π])
2. x : {x:ℝ| x ∈ [r0, π]} 
⊢ r0 ≤ rsin(x)
BY
{ (BLemma `rsin-nonneg` THEN Auto) }
Latex:
Latex:
1.  iproper([r0,  \mpi{}])
2.  x  :  \{x:\mBbbR{}|  x  \mmember{}  [r0,  \mpi{}]\} 
\mvdash{}  r0  \mleq{}  rsin(x)
By
Latex:
(BLemma  `rsin-nonneg`  THEN  Auto)
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