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Re: Cancel order


expr = Sqrt[(v1^2 + v2^2) (g^2 + gp^2)]/Sqrt[v1^2 + v2^2];

Specify your assumptions to Simplify

Simplify[expr, Element[{v1, v2}, Reals]]

Sqrt[g^2 + gp^2]

Or use PowerExpand that defaults to a maximal set of assumptions

expr // PowerExpand

Sqrt[g^2 + gp^2]


Bob Hanlon


On Tue, Nov 29, 2011 at 7:05 AM, =E9=81=93 =E5=8E=9A <shlwell1988 at gmail.com> wrote:
> How can I make Sqrt[(v1^2+v2^2)(g^2+gp^2)]/Sqrt[v1^2+v2^2] simple in
> mathematica?
>



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