$BC, AB$ and $AC$ are tangents to the circle at $D, E$ and $F$ respectively. $\angle EBD=x^{\circ}, \angle FCD=y^{\circ}.$ Then $\angle EDF$ equals
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$BC, AB$ and $AC$ are tangents to the circle at $D, E$ and $F$ respectively. $\angle EBD=x^{\circ}, \angle FCD=y^{\circ}.$ Then $\angle EDF$ equals