यदि $\operatorname{cosec}^{2} \theta = \frac{4xy}{(x+y)^{2}}$ है,तो

  • A
    $x = -y$
  • B
    $x = \frac{1}{y}$
  • C
    $x = y$
  • D
    इनमें से कोई नहीं

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यदि $\sin x + \cos x = a$,$a \in [-\sqrt{2}, \sqrt{2}] - \{-1, 1\}$,तो $\sum_{n=1}^\infty (\sin^n x + \cos^n x)$ का मान ज्ञात कीजिए।

$\sin x - \cos x$ का अधिकतम मान किसके बराबर है?

$\cot \frac{\pi}{20} \cot \frac{3 \pi}{20} \cot \frac{5 \pi}{20} \cot \frac{7 \pi}{20} \cot \frac{9 \pi}{20}$ का मान है

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$\sin \left( \frac{\pi}{10} \right) \sin \left( \frac{3\pi}{10} \right) = $

यदि $\sec \theta + \tan \theta = 2 + \sqrt{5}$ है,तो $\sin \theta$ का मान ज्ञात कीजिए।

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