यदि $\frac{\cos^4 \alpha}{\cos^2 \beta} + \frac{\sin^4 \alpha}{\sin^2 \beta} = 1$ है,तो $\left[ \frac{\cos^4 \beta}{\cos^2 \alpha} + \frac{\sin^4 \beta}{\sin^2 \alpha} \right]$ का मान ज्ञात कीजिए (जहाँ $[.]$ महत्तम पूर्णांक फलन को दर्शाता है)।

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    केवल $\alpha$ पर निर्भर करता है

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यदि $5(\tan^2 x - \cos^2 x) = 2\cos 2x + 9$ है,तो $\cos 4x$ का मान ज्ञात कीजिए।

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यदि $x=a(\sin \theta+\cos \theta)$ और $y=b(\sin \theta-\cos \theta)$ है,तो $\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}$ का मान ज्ञात कीजिए।

$\frac{\sin \theta + \sin 2\theta }{1 + \cos \theta + \cos 2\theta } = $

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