The function is a linear function.
Consider on interval
.
The definite integral is .
Describe the size of error when the Trapezoidal Rule is used to approximate .
If has a continuous second derivative on
, then the error approximating the integral
by Trapezoidal Rule is
,
.
The definite integral is .
Apply derivative on each side with respect to .
.
The error approximating the integral is .
In this case and
.
.
The size of error is zero because the Trapezoidal Rule always perfectly fit under a linear function.
\
Graph the function: on
.
.
Observe the graph:
\The Trapezoidal Rule perfectly fits a linear function.
\The size of error is zero because the Trapezoidal Rule always perfectly fit under a linear function.
\Graph of the function: on
.
.