Question 5In the diagram, $ABCD$ is a parallelogram, and $AE,BE$ are straight lines. Let $F,G$ be the intersections of $BE$ with $CD,AC$, respectively. Given $BG=EF$, find $DE/AE$. $(3-\sqrt5)/2$$(3-\sqrt6)/2$$(3-\sqrt6)/4$$(3-\sqrt7)/2$$(3-\sqrt7)/4$
