यदि $\theta$ और $\phi$ न्यून कोण हैं जो $\sin \theta = \frac{1}{2}$ और $\cos \phi = \frac{1}{3}$ को संतुष्ट करते हैं,तो $\theta + \phi \in$

  • A
    $\left( \frac{\pi}{3}, \frac{\pi}{2} \right)$
  • B
    $\left( \frac{\pi}{2}, \frac{2\pi}{3} \right)$
  • C
    $\left( \frac{2\pi}{3}, \frac{5\pi}{6} \right)$
  • D
    $\left( \frac{5\pi}{6}, \pi \right)$

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सिद्ध कीजिए कि $2 \sin ^{2} \frac{3 \pi}{4} + 2 \cos ^{2} \frac{\pi}{4} + 2 \sec ^{2} \frac{\pi}{3} = 10$.

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