When the area under 
from 
to ![]()
src="https://sciemce.com/media/3/ppg__cognero__Chapter_13_Definite_Integrals_Techniques_of_Integration__media__f574eb6a-0510-48d3-b9ea-d19f56f0dcec.PNG" style="vertical-align:middle;" /> is approximated, the formulas for the sum of n rectangles using left-hand endpoints and right-hand endpoints are:
?
Left-hand endpoints: 
?
Right-hand endpoints: 
?
Find 
and 
.
?
A. ?
?
B. ?
?
C. ?
?
D. ?
?
E. ?
?
Answer: E
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