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Step * 1 of Lemma rcos-1-implies-at-least-2pi

.....assertion..... 
1. x : {x:ℝ| r0 < x} 
2. rcos(x) = r1
⊢ rcos(x) strictly-decreasing for x ∈ [r0, π]
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Latex:

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Latex:
.....assertion..... 
1.  x  :  \{x:\mBbbR{}|  r0  <  x\} 
2.  rcos(x)  =  r1
\mvdash{}  rcos(x)  strictly-decreasing  for  x  \mmember{}  [r0,  \mpi{}]


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Latex:
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