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
    $\pm 1$
  • C
    $1$
  • D
    इनमें से कोई नहीं

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यदि $(\sin \alpha + \operatorname{cosec} \alpha)^{2} + (\cos \alpha + \sec \alpha)^{2} = K + \tan^{2} \alpha + \cot^{2} \alpha$ है,तो $K$ का मान ज्ञात कीजिए।

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निम्नलिखित व्यंजक का मान $3(\sin^{4} \theta + \cos^{4} \theta) + 2(\sin^{6} \theta + \cos^{6} \theta) + 12\sin^{2} \theta \cos^{2} \theta$ ज्ञात कीजिए।

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