\fII. Use the summation formulas below to evaluate the given integrals. n n [k = n(n + 1) n(n + 1)(2n + 1) n(n + 1) 12 i) 1 = n ii) iii) iM K2 = iv) 2 6 2 *=1 A=1 *= 1 .1 7 V3dx 8) (x + 1)3 dx 4 -1