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Step * 2 1 of Lemma rsin-positive


1. x : {x:ℝ| x ∈ (r0, π)} 
2. r0 < rcos(x - π/2)
3. x = ((x - π/2) + π/2)
⊢ r0 < rsin((x - π/2) + π/2)
BY
{ (RWO "rsin-shift-half-pi" 0 THEN Auto) }

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Latex:

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Latex:

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


By

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Latex:
(RWO  "rsin-shift-half-pi"  0  THEN  Auto)

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