Show that every compound wff is equivalent to a wff using only the connectives of ( ightarrow)

Show that every compound wff is equivalent to a wff using only the connectives of \(\rightarrow\) and '.
Exercises 47-50 show that defining four basic logical connectives (conjunction, disjunction, implication, and negation) is a convenience rather than a necessity because certain pairs of connectives are enough to express any wff.