Estimate the area under the graph of f(x)=cos((pi/4)x) from x=-2 to x=2 using 3 rectangles of equal width, using left and right endpoints.?

Answer 1

The interval is of length 4, so you will have three rectangles of width 4/3.

So, what are the left (right) endpoints?

Calculate f(x) at those three values, and multiply by the rectangle width (4/3).

Answer 2

⊿ &rrtri;