Question 13
In the triangle $ABC$, a circle passes through the point $A$, the midpoint $E$ of $AC$, the midpoint $F$ of $AB$ and is tangent to the side $BC$ at $D$. Suppose
$$\frac{AB}{AC}+\frac{AC}{AB}=4.$$
Determine the size of $\angle EDF$ in degrees.
$$\frac{AB}{AC}+\frac{AC}{AB}=4.$$
Determine the size of $\angle EDF$ in degrees.