PLEASE HELP...I have to write a program which calculates the integral

Write a program which calculates the integral of the function

f(x)=g(x)/(2*m)! , where g(x)=A*sin^m(x)

on the interval from a to b (a<b). In the main program, scanf a
non-negative integer value of m and double values of A, a, and b.
Call the function Integral() to evaluate the integral.

Your main program should be followed by four functions:

double Integral(int m, double A, double a, double b)

double funcf(double x, int m, double A) to evaluate f(x)

double funcg(double x, int m, double A) to evaluate g(x)

double m2fact(int m) to evaluate (2*m)!


When writing the function Intgral(), use the program w5-10.c
or the program from part B of your hw5, appropriately modified
to integrate an arbitrary function f(x) from a to b (letting the
program ask you for n_trap only once). Within the Integral() function
call another function funcf() to specify f(x). Within the function
funcf(), to evaluate (2*m)! call the function m2fact(), and to
to evaluate g(x) call the function funcg().

.................................................. ..............

Your output should look like this:

a.out

Enter the non-negative integer m: 3

Enter the coefficient A in g(x): 150.

Enter the bounds for the integration interval, a < b : -1.5 3.2

Integrate f(x) on [a,b]
Enter the number of trapezoids: 1000

The value of the integral is 0.153601 .

I HAVE TROUBLE WITH THE FACTORIALS ISSUES AND I'M NOT EXACTLY SURE WHERE TO START ON THIS THING.