$\Delta ABC$ में,$m \angle C = 90^{\circ}$ और $\cos B = \frac{1}{2}$ है,तो $\operatorname{cosec} A = \ldots$

  • A
    $\frac{1}{2}$
  • B
    $\sqrt{3}$
  • C
    $\frac{2}{\sqrt{3}}$
  • D
    $2$

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सिद्ध कीजिए कि $\tan ^{4} \theta+\tan ^{2} \theta=\sec ^{4} \theta-\sec ^{2} \theta$

यदि $\tan \theta + \sec \theta = l$ है,तो सिद्ध कीजिए कि $\sec \theta = \frac{l^{2} + 1}{2l}$.

$\Delta ABC$ में, $AC = 5$, $BC = 13$, $m \angle A = 90^\circ$ है, तो $\tan B = \ldots$

$\tan 5^{\circ} \cdot \tan 25^{\circ} \cdot \tan 45^{\circ} \cdot \tan 65^{\circ} \cdot \tan 85^{\circ}$ का मान $\ldots \ldots \ldots \ldots$ है।

'True' (सत्य) या 'False' (असत्य) लिखिए और अपने उत्तर का औचित्य बताइए।
$\frac{\tan 47^{\circ}}{\cot 43^{\circ}}=1$

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