यदि $\sum_{r=1}^{13} \left\{ \frac{1}{\sin \left(\frac{\pi}{4} + (r-1) \frac{\pi}{6}\right) \sin \left(\frac{\pi}{4} + \frac{r\pi}{6}\right)} \right\} = a\sqrt{3} + b$,जहाँ $a, b \in \mathbb{Z}$,तो $a^2 + b^2$ का मान ज्ञात कीजिए:

  • A
    $10$
  • B
    $2$
  • C
    $8$
  • D
    $4$

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श्रेणी $\sum_{n=1}^{\infty} \sin \left(\frac{n! \pi}{720}\right)$ का योग क्या है?

गुणनफल $(1+\tan 1^{\circ})(1+\tan 2^{\circ})(1+\tan 3^{\circ}) \dots (1+\tan 45^{\circ})$ का मान क्या है?

यदि $\cos \alpha + \cos \beta = a$,$\sin \alpha + \sin \beta = b$ और $\alpha - \beta = 2 \theta$ है,तो $\frac{\cos 3 \theta}{\cos \theta} = $

यदि $\sin \alpha = \sin \beta$ और $\cos \alpha = \cos \beta$ है,तो किसी पूर्णांक $n$ के लिए $\alpha - \beta = $ क्या होगा?

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

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