When we have the case t E(ϕ ∧ ψ) the slides say we need to convert the formula ϕ of Eϕ into dnf then apply E(ϕ ∨ ψ).

For this question EGE((Fb) ∧ (Fa)) we have to convert it to CTL, i am not sure of how i can convert ((Fb) ∧ (Fa)) to dnf and then apply the formula for the case E(ϕ ∨ ψ).