यदि $x \sin^3 \alpha + y \cos^3 \alpha = \sin \alpha \cos \alpha$ और $x \sin \alpha - y \cos \alpha = 0$ है,तो $x^2 + y^2 = $

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    इनमें से कोई नहीं

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मान लीजिए $S = \{x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right) : 9^{1-\tan^2 x} + 9^{\tan^2 x} = 10\}$ और $\beta = \sum_{x \in S} \tan^2\left(\frac{x}{3}\right)$,तो $\frac{1}{6}(\beta - 14)^2$ का मान ज्ञात कीजिए।

यदि $e^{\sin x}-e^{-\sin x}-4=0$ है, तो $x$ के वास्तविक मानों की संख्या है

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