$\cos 24^{\circ} + \cos 55^{\circ} + \cos 125^{\circ} + \cos 204^{\circ} + \cos 300^{\circ}$ का मान है

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

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यदि $\frac{\pi}{2} < \alpha < \pi$ और $\pi < \beta < \frac{3\pi}{2}$,जहाँ $\sin \alpha = \frac{15}{17}$ और $\tan \beta = \frac{12}{5}$ है,तो $\sin(\beta - \alpha)$ का मान ज्ञात कीजिए। ($/221$ में)

यदि $A + B + C = 180^o$ है,तो $\cot \frac{A}{2} + \cot \frac{B}{2} + \cot \frac{C}{2}$ का मान क्या होगा?

$\sqrt{\frac{1+\cos \theta}{1-\cos \theta}}+\sqrt{\frac{1-\cos \theta}{1+\cos \theta}}=$

$\text{cosec } A - 2 \cot 2A \cos A = $

यदि $\sin \theta + \cos \theta = 1$ है,तो $\sin \theta \cos \theta = $

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