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JEE Mains · Maths · STD 12 - 8. Application and integration

ધારોકે \(\Delta\) એ પ્રદેશ \(\left\{(x, y) \in R ^2: x^2+y^2 \leq 21, y^2 \leq 4 x, x \geq 1\right\}\) નું ક્ષેત્રફળ છે. તો \(\frac{1}{2}\left(\Delta-21 \sin ^{-1} \frac{2}{\sqrt{7}}\right)=................\)

  1. A \(2 \sqrt{3}-\frac{1}{3}\)
  2. B \(\sqrt{3}-\frac{2}{3}\)
  3. C \(2 \sqrt{3}-\frac{2}{3}\)
  4. D \(\sqrt{3}-\frac{4}{3}\)
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Answer & Solution

Correct Answer

(D) \(\sqrt{3}-\frac{4}{3}\)

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Detailed explanation

\(\text { Area } 2 \int \limits_1^3 2 \sqrt{x} d x+2 \int_3^{\sqrt{21}} \sqrt{21-x^2 d x}\) \(\Delta=\frac{8}{3}(3 \sqrt{3}-1)+21 \sin ^{-1}\left(\frac{2}{\sqrt{7}}\right)-6 \sqrt{3}\)…
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