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QUESTION
estimate the area under the graph f(x)=sin(pix) from x=0 to x=1 using the area of 3 rectangles of equal width, with heights of the rectangles
estimate the area under the graph f(x)=sin(pix) from x=0 to x=1 using the area of 3 rectangles of equal width, with heights of the rectangles determined by the height of the curve at
a) left endpoints
b) right endpoints
