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Tip revision: f506282e07b9a3be7c0f65f74b7bd1ce869ea1ed authored by Barak A. Pearlmutter on 15 January 2021, 18:08:38 UTC
typo
Tip revision: f506282
arctan 
ARCTAN num
(ARCTAN x y)

	outputs the arctangent, in degrees, of its input.  With two
	inputs, outputs the arctangent of y/x, if x is nonzero, or
	90 or -90 depending on the sign of y, if x is zero.
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