X \phi (x) y \phi (y)=(x y) \phi (\sqrt xy)

请输入您的数学问题…… x \phi (x) y \phi (y)=(x y) \phi (\sqrt xy)

问题

x ϕ (x) y ϕ (y) = (x y) ϕ (x y)

Verification required

Please type the verification code shown