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

यदि \(\left(\sin ^{-1} x \right)^{2}-\left(\cos ^{-1} x \right)^{2}= a ; 0 < x <1, a \neq 0\), है, तो \(2 x ^{2}-1\) का मान है

  1. A \(\cos \left(\frac{4 \mathrm{a}}{\pi}\right)\)
  2. B \(\sin \left(\frac{2 \mathrm{a}}{\pi}\right)\)
  3. C \(\cos \left(\frac{2 \mathrm{a}}{\pi}\right)\)
  4. D \(\sin \left(\frac{4 \mathrm{a}}{\pi}\right)\)
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Answer & Solution

Correct Answer

(B) \(\sin \left(\frac{2 \mathrm{a}}{\pi}\right)\)

Step-by-step Solution

Detailed explanation

\(\text { Given } \mathrm{a}=\left(\sin ^{-1} \mathrm{x}\right)^{2}-\left(\cos ^{-1} \mathrm{x}\right)^{2}\) \(=\left(\sin ^{-1} \mathrm{x}+\cos ^{-1} \mathrm{x}\right)\left(\sin ^{-1} \mathrm{x}-\cos ^{-1} \mathrm{x}\right)\)…
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