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JEE Mains · Maths · STD 12 - 2. inverse trigonometric function

माना \(x =\sin \left(2 \tan ^{-1} \alpha\right)\) तथा \(y =\sin \left(\frac{1}{2} \tan ^{-1} \frac{4}{3}\right)\) हैं। यदि \(S =\left\{\alpha \in R : y ^2=1- x \right\}\) है, तो \(\sum_{\alpha \in S } 16 \alpha^3\) बराबर है \(...........\)

  1. A \(131\)
  2. B \(140\)
  3. C \(150\)
  4. D \(130\)
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Answer & Solution

Correct Answer

(D) \(130\)

Step-by-step Solution

Detailed explanation

\(\because \quad x=\sin \left(2 \tan ^{-1} \alpha\right)=\frac{2 \alpha}{1+\alpha^{2}}\) and \(y=\sin \left(\frac{1}{2} \tan ^{-1} \frac{4}{3}\right)=\sin \left(\sin ^{-1} \frac{1}{\sqrt{5}}\right)=\frac{1}{\sqrt{5}}\) Now, \(y^{2}=1-x\)…
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