[tex]\Large\begin{aligned}&D_f:\sqrt{2x-4}\not=0 \wedge 2x-4\geq0\\&D_f:2x-4\not=0 \wedge 2x\geq 4\\&D_f:2x\not =4 \wedge x\geq 2\\&D_f:x\not =2 \wedge x\geq 2\\&D_f:x>2\end[/tex]
