यदि $\sin x + \sin y = \frac{\sqrt{3}+1}{2}$ और $\cos x + \cos y = \frac{\sqrt{3}-1}{2}$ है,तो $\tan^2 \left(\frac{x-y}{2}\right) + \tan^2 \left(\frac{x+y}{2}\right) = $

  • A
    $8+4 \sqrt{3}$
  • B
    $6+4 \sqrt{3}$
  • C
    $3+\sqrt{3}$
  • D
    $12+6 \sqrt{3}$

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मान ज्ञात कीजिए: $\sqrt{3} \operatorname{cosec} 20^{\circ} - \sec 20^{\circ}$

$\sqrt{3} \csc 20^{\circ} - \sec 20^{\circ} = $

मान ज्ञात कीजिए: $(\cos 252^{\circ} - \sin 126^{\circ})(\cos 252^{\circ} + \sin 126^{\circ})(\sin^2 126^{\circ} + \sin^2 186^{\circ} + \sin^2 66^{\circ})$

यदि $\sin \theta + \sin^2 \theta = 1$ और $\cos^{12} \theta + a \cos^{10} \theta + b \cos^8 \theta + c \cos^6 \theta + d = 0$ है,तो:

यदि $A, B, C, D$ एक चक्रीय चतुर्भुज के कोण हैं,तो $\cos A + \cos B + \cos C + \cos D = $

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