`e313a1`

Subject: ATAN
Category: value
Formula: =ATAN(-1)
Canonical: —

Per-engine results

matches canonical diverges no fixture

Engine	Verdict	Value
gsheets	diverge	-0.785398
excel	diverge	-0.785398
lattice	diverge	-0.785398
ironcalc	diverge	-0.785398163
hyperformula	diverge	-0.785398
libreoffice	diverge	-0.785398
formulas	diverge	-0.785398
pycel	diverge	-0.785398