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Question:
Using integration find area of the region bounded by the curves y=√(5-x^2) and y=|x-1|
Answer:

Given, the equation of curves are:

  y = √(5 - x2 ) .................1

and y = |x - 1| .................2

Curve 1 is the part of circle x2 + y2 = 5 which is above the x-axis. 

From equation 1 and 2, we get

      √(5 - x2 ) = |x - 1|

=> 5 - x2  = (x - 1)2

=> 5 - x2  = x2  + 1 - 2x

=> x2  + 1 - 2x + x2  - 5 = 0 

=> 2x2 - 2x - 4 = 0

=> x2 - x - 2 = 0

=> (x - 2)*(x + 1) = 0

=> x = 2, -1

Now, required area = 2-1 √(5 - x2 ) dx - f|x - 1| dx

Now 2-1 √(5 - x2 ) dx = [x√(5 - x2 )/2 + (5/2)*sin-1 (x/√5) -1]2

=>  2-1 √(5 - x2 ) dx = 1 + (5/2)*sin-1 (2/√5) - {-1 + (5/2)*sin-1 (-1/√5)}

=>  2-1 √(5 - x2 ) dx = 2 + (5/2)*[sin-1 (2/√5) + sin-1 (1/√5)}

=>  2-1 √(5 - x2 ) dx = 2 + (5/2)*[sin-1 {(2/√5)*{√(1 - 1/5)} + (1/√5)*{√(1 - 4/5)}}]

=>  2-1 √(5 - x2 ) dx = 2 + (5/2)*sin-1 {(2/√5)*(2/√5) + (1/√5)*(1/√5)}

=>  2-1 √(5 - x2 ) dx = 2 + (5/2)*sin-1 (1)

=>  2-1 √(5 - x2 ) dx = 2 + (5/2)*(π/2)

=>  2-1 √(5 - x2 ) dx = 2 + 5π/4

Again,

2-1 |x - 1| dx = 1-1 |x - 1| dx + 21 |x - 1| dx 

=> 2-1 |x - 1| dx = - 1-1 (x - 1) dx + 21 (x - 1) dx 

=> 2-1 |x - 1| dx = [x - x2 /2 -1]+ [x2 /2 - x 1]

=> 2-1 |x - 1| dx = {1 - (1/2) - (-1 - 1/2)} + {4/2 - 2 - (1/2 - 1) }

=> 2-1 |x - 1| dx = 1/2 + 3/2 + 1/2

=> 2-1 |x - 1| dx = 5/2

So, the required area =  2 + 5π/4 - 5/2 = 5π/4 - 1/2 square units

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