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Step * of Lemma rtan_wf

∀x:{x:ℝ| x ∈ (-(π/2), π/2)} . (rtan(x) ∈ ℝ)
BY
{ (InstLemma `rcos-positive` [] THEN ParallelLast THEN ProveWfLemma) }

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Latex:

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Latex:
\mforall{}x:\{x:\mBbbR{}|  x  \mmember{}  (-(\mpi{}/2),  \mpi{}/2)\}  .  (rtan(x)  \mmember{}  \mBbbR{})


By

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Latex:
(InstLemma  `rcos-positive`  []  THEN  ParallelLast  THEN  ProveWfLemma)

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