Trapezoidal Rule in C Language Here in this blog we will see how to evaluate the integration of function using the very easy and popular method i.e Trapezoidal Method. Later in the subsection of this blog we will see a program that evaluate the integration of given function in C Language. Approach:- First of all let's us discuss the rule or approach of this method. We approximate the function f(x) in the interval [xi ,xi+1] by a straight line joining the points (xi,yi) and (xi+1,yi+1). Popularity:- This method is very handy to calculate the integration of linear function. Geometrically, the integral in an interval is approximated by the area of a trapezium. Trapezoidal Rule Formula:- a[f(x)dx]b = h/2*{y0+yn+2*(y1+y2+y3+y4+.......................+yn-1)} where a=lower limit of function f(x) b=upper limit of function f(x) ...