//*****************************************************////////*****************************************************#include <stdio.h>#include <math.h>#define PI 3.14159void main(){ int i, x, N; double a, b, fx, h; x = 0; a = (PI/4); b = (PI/2); //printf("a and b = %f %f,\n", a, b); printf("How many intervals would you like to use to estimate the solution?\n"); scanf("%i", &N); h = (b - a)/(double) N; //printf("h = %f.\n", h); fx = 0; //printf("fx = %f.\n", fx); for (i = a; i <= b; i += h) { fx = h * (0.5 *(i) / sin((double) i)); fx += fx; } printf("Solution calculated. f(x) = %2.6lf .\n", fx); return;}