Consider the function f defined on [0, 1] such that f(0) = 1, f(1) = 3, f(1/5) = f(3/5) = 4, and f(2/5) = f(4/5) = c. Suppose that the approximation of I = f(x)dx by composite Trapezoidal rule with 5...

Extracted text: Consider the function f defined on [0, 1] such that f(0) = 1, f(1) = 3, f(1/5) = f(3/5) = 4, and f(2/5) = f(4/5) = c. Suppose that the approximation of I = f(x)dx by composite Trapezoidal rule with 5 subintervals is 1.8, then the value of c is: 0.5 O 4 -0.5 O 2