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MathGroup Archive 2001

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ArcTan[x, 0] With Numeric Values

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30544] ArcTan[x, 0] With Numeric Values
  • From: "David Park" <djmp at earthlink.net>
  • Date: Tue, 28 Aug 2001 04:54:49 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Dear MathGroup,

Why does this two argument form of ArcTan not automatically simplify with
numeric input? It does simplify with number input.

{ArcTan[5, 0], ArcTan[Sqrt[5], 0], ArcTan[Pi, 0]}
Simplify[%]
FullSimplify[%]

{0, ArcTan[Sqrt[5], 0], ArcTan[Pi, 0]}
{0, 0, ArcTan[Pi, 0]}
{0, 0, 0}

One would normally expect the same simplification to automatically occur in
all three of these cases.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



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