One problem with using rectangles to approximate an area under a curve is it will overestimate or underestimate the area, depending on which endpoint is used. The trapezoidal method gives a closer approximation.
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scientific method can be adopted to solve complex problem
Then you have 6 vertices. No problem.
More information is needed to solve this problem
what did you do to get the answer of the problem.
I'm not sure what a "method" represents, unless you mean a strategy of finding a problem. A product is the answer to a multiplication problem.