Approximate the value of the given integral by completing parts (a) and (b) below (a) Use the trapezoidal rule, using n = 4 (b) Check by direct integration. 5x2 dx (a) Use the trapezoidal rule to approximate the integral 5x2 dx ~ O (Type an integer or a decimal.) b) Find the exact value of the integral by integration 5 x2 dx =