Let R denote the region that lies below the graph of f(x)=2+4 x2 on the interval [1 ,4 ].

Estimate the area of R using six approximating rectangles of the same width and

(a) left endpoints,

(b) right endpoints.

Estimate the area of R using six approximating rectangles of the same width and

(a) left endpoints,

(b) right endpoints.

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