3. Prove the following using the properties of regular expressions. For each transformation, state the rule you used (such as dot 1.3) and the substitution (R=a,T=b). (ab)+c+c=+ab+(ab)+c(+c) 4. Prove the following using the properties of regular expressions. For each transformation, state the rule you used (such as dot 1.3) and the substitution (R=a,T=b). a(b+cd)=a(b+c)+acdd