यदि $A$ तीसरे चतुर्थांश में स्थित है और $3 \tan A - 4 = 0$ है,तो $5 \sin 2A + 3 \sin A + 4 \cos A$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    इनमें से कोई नहीं

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यदि $a \tan \alpha + b \tan \beta = (a + b) \tan \left( \frac{\alpha + \beta}{2} \right)$ और $\alpha - \beta \neq 2n\pi$ है,तो $\frac{\cos \beta}{\cos \alpha} = $

$\sum_{k=0}^4 \sin^2 \left( (2k+1) \frac{\pi}{20} \right) =$

$\sin \frac{2 \pi}{5}+\sin \frac{4 \pi}{5}+\sin \frac{6 \pi}{5}+\sin \frac{8 \pi}{5}$ का मान ज्ञात कीजिए।

$\cos ^2 76^{\circ}+\cos ^2 16^{\circ}-\cos 76^{\circ} \cos 16^{\circ}$ का मान ज्ञात कीजिए।

यदि $\sin x + \sin^2 x = 1$ है,तो $\cos^8 x + 2\cos^6 x + \cos^4 x = $

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