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Question

Using method of integration find the area bounded by the curve |x| + |y| = 1.

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Solution

The given curve is |x| + |y| = 1
In first quadrant, (x > 0, y > 0)
Then, the line BC is x + y = 1
In third quadrant (x < 0, y <0)
Then, the line CD is -x- y =1
In fourth quadrant (x > 0, y > 0)
Then, the line DA is (x - y = 1)
Since, ABCD is a square.
Required area = 4 [Area of shaded region in the first quadrant]
=410(1x)dx(x+y=1y=1x)=4[xx22]10=4[(112)0]=2 sq unit


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