Definite Integrals Let ?(x) be the primitive or anti-derivative of a function f(x) defined on [a, b] i.e., . Then the definite integral of f(x) over [a,b] is denoted by and is defined as [?(b) − ?(a)] i.e., . This is also called Newton Leibnitz formula.The numbers a and b are called the limits of integration, ‘a’ is called the lower limit and ‘b’ the upper limit. The … [Read more...] about Definite Integrals