Logic class!--rules of replacement?

Question

I'm stuck on this question -

I need to find the regular proof

1. A = B

2. A v B

3. A > (B > C) / C

Can someone help please

Answer 1

1. A <-> B                    

2. A v B                      

3. A -> (B -> C)............../C

4. (A & B) v (~A & ~B)..1, Equiv

5. (A & B) v ~(A v B).....4, DM

6. ~(A v B) v (A & B).....5, Com

7. (A v B) -> (A & B).....6, Impl

8. A & B......................2,7, MP

9. (A & B) -> C.............3, Exp

10. C........................8,9, MP