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Step * 2 of Lemma arctangent1


1. (π/r(4)) ∈ {x:ℝ| (-(π/2) < x) ∧ (x < π/2)} 
⊢ arctangent(r1) = (π/r(4))
BY
{ (RWO "rtan-pi-over-4<" 0 THEN Auto) }

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Latex:

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Latex:

1.  (\mpi{}/r(4))  \mmember{}  \{x:\mBbbR{}|  (-(\mpi{}/2)  <  x)  \mwedge{}  (x  <  \mpi{}/2)\} 
\mvdash{}  arctangent(r1)  =  (\mpi{}/r(4))


By

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Latex:
(RWO  "rtan-pi-over-4<"  0  THEN  Auto)

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