Use n = 4 to approximate the value of the integral by the following methods: (a) the trapezoidal rule, and (b) Simpson's rule. (0) Find the exact value by integration. 2 I(9x2+1) dx (a) Use the trapezoidal rule to approximate the integral. 2 I(9x2+1) dwa 0 (Round the final answer to three decimal places as needed. Round all intermediate values to four decimal places as needed.)