Show that Extended Jaccard Coefficient (EJ) reduce to Jaccard coefficient (J) if x and y are binary vectors.

J = (f₁₁) / (f₀₁ + f₁₀ + f₁₁),

where f₀₁ = the number of attributes where x was 0 and y was 1; f₁₀ = the number of attributes where x was 1 and y was 0, f₀₀ = the number of attributes where x was 0 and y was 0, f₁₁ = the number of attributes where x was 1 and y was 1.

EJ(x,y)=x2+y2xyxy