# calculus

posted by
**Anonymous**
.

The approximation to the area under the graph of the function f(x)= 1/(1+x^2)

on the interval [-1,1], using four rectangles and the midpoint rule is

posted by
**Anonymous**
.

The approximation to the area under the graph of the function f(x)= 1/(1+x^2)

on the interval [-1,1], using four rectangles and the midpoint rule is