Prove the equivalence by complete conjunctive normal form

Question

Response to the following problem:

Show that switching functions

ƒ₁(x₁,x₂,x₃) = x₁x₂ + x₂x₃ + x¯₁x₃ ,

ƒ₂(x₁,x₂,x₃) = x₁x₂ + x¯₁x₃ ,

have the same disjunctive normal form, i.e., they are equal functions. Prove the equivalence of these functions also by using the complete conjunctive normal form.