यदि $A+B+C=180^{\circ}$ है,तो $\tan \left(\frac{A+B}{2}\right)=$ ...........

  • A
    $\cot \left(\frac{A+B}{2}\right)$
  • B
    $\cot \frac{C}{2}$
  • C
    $\sec \frac{C}{2}$
  • D
    $\sin \frac{A}{2}$

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सिद्ध कीजिए कि,
$\frac{\sin \theta}{1+\cos \theta}+\frac{1+\cos \theta}{\sin \theta}=2 \operatorname{cosec} \theta$

यदि $\sin \theta + \sin^2 \theta = 1$ है,तो $\cos^2 \theta + \cos^4 \theta = \dots$

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यदि $\operatorname{cosec} \theta = \frac{2}{\sqrt{3}}$ है,तो $\theta = \ldots$ ($^\circ$ में)

$2 \sin ^{2} \theta+4 \sec ^{2} \theta+5 \cot ^{2} \theta+2 \cos ^{2} \theta-4 \tan ^{2} \theta-5 \operatorname{cosec}^{2} \theta = \dots$

यदि $\tan \theta = \frac{5}{12}$ है,तो $\cos \theta = \ldots$

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