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Step * 2 1 of Lemma arctangent-rinv


1. x : {x:ℝ| x ∈ (r0, ∞)} 
⊢ (r(2) * arctangent(r1)) = π/2
BY
{ (RWO "arctangent1" 0 THEN Auto) }

1
1. x : {x:ℝ| x ∈ (r0, ∞)} 
⊢ (r(2) * (π/r(4))) = π/2

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Latex:

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Latex:

1.  x  :  \{x:\mBbbR{}|  x  \mmember{}  (r0,  \minfty{})\} 
\mvdash{}  (r(2)  *  arctangent(r1))  =  \mpi{}/2


By

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Latex:
(RWO  "arctangent1"  0  THEN  Auto)

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