Question 159
Points $D$ and $E$ divide side $[A B]$ of an equilateral triangle into three equal parts, in such a way that $D$ lies between $A$ and $E$. Point $F$ lies on $[B C]$ so that $C F = A D$. Compute the sum of the angles $\widehat{C D F} + \widehat{C E F}$.
