Please write c++ program to slove question 5. Question 5 is based on question 3a and I have solved the question 3a. Please follow the requirements of question 5. Thanks in advance!

Following is my answer for question 3a:

#include

#include

using namespace std;

double fun(double x)

{

return pow(x*x*x*x,1.0/3.0);

}

int main()

{

double x=0,h1,h2,h3,e1=1000,e2=1000,e3=1000;

for(int p=3;p

{

double h=pow(10,-p);

double M=(fun(x+h)-fun(x))/h;

if(fabs(M)

{

h1=h;

e1=M;

}

cout

M=(fun(x+h)-fun(x-h))/(2.0*h);

if(fabs(M)

{

h2=h;

e2=M;

}

cout

M=(-fun(x+2.0*h)+4.0*fun(x+h)-3.0*fun(x))/(2.0*h);

cout

if(fabs(M)

{

h3=h;

e3=M;

}

}

cout

cout

cout

return 0;

}

5. (extra credit) 10 points repeat problem 3a except using "complex step differentiation." 3. a. (i) Compare the accuracy of the following three formulas for approxi- mating the derivative, f'(x): Mi(n) = f(x + h) f(x) h ) Mach)-f(x+h)-f( x 2h Mach) -f(x + 2h) + 4f (x + h) - 3f (x) 2h In particular, test the above approximations when f(x) = x/3, x = 0 or r = 1, and h = 10-P, p = 3, 4, 5,..., 20. (ii) As his decreased, the error becomes smaller, until a critical value of h is reached, after which point the error starts to increase as h decreases. Find the critical h, herit, experimentally. Note: in order to avoid problems in evaluating 24/3 when r