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Step * 2 1 1 1 of Lemma arctangent-rinv


1. x : {x:ℝ| x ∈ (r0, ∞)} 
⊢ (r(2) * 2 * π/2) = (r(4) * π/2)
BY
{ (RWO "int-rmul-req" 0 THEN Auto) }

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Latex:

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Latex:

1.  x  :  \{x:\mBbbR{}|  x  \mmember{}  (r0,  \minfty{})\} 
\mvdash{}  (r(2)  *  2  *  \mpi{}/2)  =  (r(4)  *  \mpi{}/2)


By

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Latex:
(RWO  "int-rmul-req"  0  THEN  Auto)

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