[9 Marks] (Long Answer Question) File Upload Required (a) Show that the following identity is true 1 2n +1 n2 (n + 1)2 n? (n + 1)2 (b) Use the identity in part (a) to find the formula for the nth partial sum of the series 00 E 2n +1 n=1 n? (n + 1)2 (c) Use the formula for the nth partial sum obtained in part (b) to determine the convergence or divergence of the series CO 2n +1 n=1 n' (n + 1)2