File: trapez.py

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from math import *

def sqr(a):
	return a**2

def trapez(f, a, b, n):
	h = (b-a) / n
	sum = f(a)
	for i in range (1,n):
		sum = sum + 2 * f(a + h * i)
	sum = sum + f(b)
	return 0.5 * h * sum

print trapez(sin,0.,pi,100)
print trapez(sqr,0.,2.,100)
print trapez(sqr,0,2,100)   # Why the error ?