$\sin^{2} \theta = \frac{(x+y)^{2}}{4xy}$ केवल तब संभव है जब

  • A
    $x > 0, y > 0, x \neq y$
  • B
    $x > 0, y > 0, x = y$
  • C
    इनमें से कोई नहीं
  • D
    $x < 0, y < 0, x = y$

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यदि $x \sin \theta = y \sin \left( \theta + \frac{2\pi}{3} \right) = z \sin \left( \theta + \frac{4\pi}{3} \right)$ है,तो:

यदि $\cos ^{2} x+\cos ^{4} x=1$ है,तो $\tan ^{2} x+\tan ^{4} x=?$

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

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