Calculate the definite integral value of a unary function online

This page calculates the definite integral of a unary function.
Enter the function expression in the edit box after f(x)= below.
For the syntax of the function expression, please see the web page
of > Function Expression. Also enter the lower and upper limits of
the integral x1 and x2 (x1<x2) below. The range of variables is
generally the number of inputs, but you can also enter a constant
expression. For the input method of a constant expression, see the
constant expression web page. Then click on the "Start Integration"
button, the curve of the given function within the given range will
be displayed and the integral value will be given.