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Problem

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1 Dec 2021

Given information

The given function is 

Step-by-step explanation

Step 1.
 
We sketch the graph of   in the interval    in figure.
We see that the graph of    is same in the interval   below the   - axis as the graph of   in the interval    above the   -axis (same in magnitude)
We can estimate the value of the integral   
By the difference of the sum of the areas above the $x$-axis and the sum of the areas below the   axis
Or   

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