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JEE Mains · Maths · STD 11 - 3. trignometrical ratios,functions and identities

\(\sin ^{2} 2 \theta+\cos ^{4} 2 \theta=\frac{3}{4}\) को संतुष्ट करने वाले \(\theta \in\left(0, \frac{\pi}{2}\right)\) के सभी मानों का योग है

  1. A \(\pi \)
  2. B \(\frac{{5\pi }}{4}\)
  3. C \(\frac{{\pi }}{2}\)
  4. D \(\frac{{3\pi }}{8}\)
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Answer & Solution

Correct Answer

(C) \(\frac{{\pi }}{2}\)

Step-by-step Solution

Detailed explanation

\({\sin ^2}2\theta \, + \,{\cos ^4}2\theta \, = \frac{3}{4}\) Let \(\,{\cos ^2}2\theta \, =t \) \( \Rightarrow \,1\, - \,\,{\cos ^2}2\theta \, + \,{\cos ^4}2\theta \, = \frac{3}{4}\) \( \Rightarrow t = \frac{1}{2}\, \Rightarrow \,\,{\cos ^2}2\theta \, = \frac{1}{2}\,\)…
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