(a) For integer n > 1, use upper and lower Riemann sums with n equal subdivisions to find an upper and lower bound for the value of '/:{1 2%) dz. You may use the following fact without proof: Z k% = k=1 n(n+1)(2n + 1) e 1 b} Ewaluate 1 z%) dz using the definition of Riemann integral. g g 0