यदि $\cos \theta = \frac{8}{17}$ और $\theta$ $1^{st}$ चतुर्थांश में स्थित है,तो $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ का मान है

  • A
    $\frac{23}{17} \left( \frac{\sqrt{3} - 1}{2} + \frac{1}{\sqrt{2}} \right)$
  • B
    $\frac{23}{17} \left( \frac{\sqrt{3} + 1}{2} + \frac{1}{\sqrt{2}} \right)$
  • C
    $\frac{23}{17} \left( \frac{\sqrt{3} - 1}{2} - \frac{1}{\sqrt{2}} \right)$
  • D
    $\frac{23}{17} \left( \frac{\sqrt{3} + 1}{2} - \frac{1}{\sqrt{2}} \right)$

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यदि $\cos \alpha + \cos \beta = \frac{1}{3}$ और $\sin \alpha + \sin \beta = \frac{1}{4}$ है,तो $\cos (\alpha + \beta) = $

$\cos(36^{\circ}-A) \cos(36^{\circ}+A) + \cos(54^{\circ}+A) \cos(54^{\circ}-A) = $

यदि दो कोण $\alpha, \beta$ इस प्रकार हैं कि $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ और $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,तो $(2 \alpha+\beta)=$

$4 \sin 5^\circ \sin 55^\circ \sin 65^\circ$ का मान ज्ञात कीजिए।

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