∀ {α : Type u_1} {β : Type u_2} [inst : MulOneClass α] [inst_1 : MulZeroOneClass β] (f : α →* β) (x x_1 : WithZero α),
  WithZero.recZeroCoe 0 (⇑f) (x * x_1) = WithZero.recZeroCoe 0 (⇑f) x * WithZero.recZeroCoe 0 (⇑f) x_1