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Step * 2 1 of Lemma arctangent-rtan


r0 ∈ {x:ℝ| (-(π/2) < x) ∧ (x < π/2)} 
BY
{ ((MemTypeCD THEN Auto) THEN nRMul ⌜r(-1)⌝ 0⋅ THEN Auto) }

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Latex:

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Latex:

r0  \mmember{}  \{x:\mBbbR{}|  (-(\mpi{}/2)  <  x)  \mwedge{}  (x  <  \mpi{}/2)\} 


By

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Latex:
((MemTypeCD  THEN  Auto)  THEN  nRMul  \mkleeneopen{}r(-1)\mkleeneclose{}  0\mcdot{}  THEN  Auto)

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