20 xn + f(x) = [(1)n+1, n=1 Write a C program that computes the value of the above math function for a given x using the concept of functions in C. Your program should test your C function double f(double x) using the following values of x: 0.3, 0.5, and 0.8. For the previous values of f(x) compare the results to ln(1 + x) using a calculator. n