2 Approximating a The value of t can be approximated using the Nilakantha series 4 2. 3.4 3+ 8.9. 10 * 10 - 11 - 12 12. 13. 14*** Write a C function that calculates the value of with a variable level of accuracy. For instance, if the desired accuracy is 10-6, the absolute difference between the true value of (see below) and the approximation from your function is less than 10 . Use the function prototype double Pi_value(int numaccuracy); ASSERT your function by running unit tests (see 5.7 in your Zybook) for numaccuracy values 1, 2, 3, 4, 5, 6. Append the output to the file My Pi.tact Examples of testing your function are const double pi - 3.141592653589793238462643383; assert(fabs (Pi_value(2) - pi)