Name: Directions: Write or type solutions on a separate paper(s) and attach this paper to the front of your work. Prove each of the following using induction ?21 = n(n + 1) 3n+13 3. 2n+1 1 4. 14 (3+n-2+ 52+1) for n2l cos0 + isin 0)" cos ne + isin ne Extra Credit Determine and prove the equivalent equation df