V3/usr/man/man3/atan.3

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NAME		atan -- arc tangent function
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SYNOPSIS	jsr	r5,atan[2]
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DESCRIPTION	The
atan entry returns the arc tangent
of fr0 in fr0.
The range is -J/2 to J/2.
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The atan2 entry returns the arc tangent
of fr0/fr1 in fr0.
The range is -J to J.
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FILES		kept in /lib/liba.a
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SEE ALSO	--
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DIAGNOSTICS	there is no error return
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BUGS		--