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ArcTan[x, 0] With Numeric Values


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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