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STATEMENT- 1: The area bounded by the cu...

STATEMENT- 1: The area bounded by the curves `y = x^(2)` and `y = (2)/(1+ x^(2))` is `2 ((pi)/(2) - (1)/(3))` sq. units
and
STATEMENT-2 : The curves meet at a point whose abscissae are `pm2`.

A

(a)Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-1

B

(b)Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1

C

(c)Statement-1 is True , Statement-2 is False

D

(d)Statement-1 is False , Statement-2 is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of finding the area bounded by the curves \( y = x^2 \) and \( y = \frac{2}{1+x^2} \), we will follow these steps: ### Step 1: Find the points of intersection To determine the area between the curves, we first need to find the points where they intersect. We set the equations equal to each other: \[ x^2 = \frac{2}{1+x^2} \] Multiplying both sides by \( 1 + x^2 \) to eliminate the fraction gives: \[ x^2(1 + x^2) = 2 \] This simplifies to: \[ x^4 + x^2 - 2 = 0 \] Let \( u = x^2 \). Then the equation becomes: \[ u^2 + u - 2 = 0 \] ### Step 2: Solve the quadratic equation Using the quadratic formula \( u = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \): \[ u = \frac{-1 \pm \sqrt{1^2 - 4 \cdot 1 \cdot (-2)}}{2 \cdot 1} = \frac{-1 \pm \sqrt{1 + 8}}{2} = \frac{-1 \pm 3}{2} \] This gives us: \[ u = 1 \quad \text{or} \quad u = -2 \] Since \( u = x^2 \), we only consider \( u = 1 \): \[ x^2 = 1 \implies x = \pm 1 \] ### Step 3: Set up the integral for the area The area \( A \) between the curves from \( x = -1 \) to \( x = 1 \) is given by: \[ A = \int_{-1}^{1} \left( \frac{2}{1+x^2} - x^2 \right) \, dx \] ### Step 4: Calculate the integral We can split the integral: \[ A = \int_{-1}^{1} \frac{2}{1+x^2} \, dx - \int_{-1}^{1} x^2 \, dx \] The first integral can be calculated as: \[ \int \frac{2}{1+x^2} \, dx = 2 \tan^{-1}(x) \] Evaluating from \(-1\) to \(1\): \[ \left[ 2 \tan^{-1}(x) \right]_{-1}^{1} = 2 \left( \tan^{-1}(1) - \tan^{-1}(-1) \right) = 2 \left( \frac{\pi}{4} - \left(-\frac{\pi}{4}\right) \right) = 2 \cdot \frac{\pi}{2} = \pi \] The second integral is: \[ \int_{-1}^{1} x^2 \, dx = \left[ \frac{x^3}{3} \right]_{-1}^{1} = \frac{1}{3} - \left(-\frac{1}{3}\right) = \frac{2}{3} \] ### Step 5: Combine the results Now, substituting back into the area formula: \[ A = \pi - \frac{2}{3} \] ### Step 6: Final expression for the area To express the area in the required form: \[ A = \frac{3\pi}{3} - \frac{2}{3} = \frac{3\pi - 2}{3} \] However, the problem states that the area is \( 2 \left( \frac{\pi}{2} - \frac{1}{3} \right) \): \[ 2 \left( \frac{\pi}{2} - \frac{1}{3} \right) = \pi - \frac{2}{3} \] Thus, **Statement 1 is true**. ### Step 7: Verify Statement 2 From our earlier calculations, the points of intersection were \( x = \pm 1 \), not \( x = \pm 2 \). Therefore, **Statement 2 is false**. ### Conclusion - **Statement 1**: True - **Statement 2**: False
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