જો $\tan \alpha$ અને $\tan \beta$ એ સમીકરણ $x^2 + px + q = 0$ $(p \ne 0)$ ના બીજ હોય,તો:

  • A
    $\sin^2(\alpha + \beta) + p\sin(\alpha + \beta)\cos(\alpha + \beta) + q\cos^2(\alpha + \beta) = q$
  • B
    $\tan(\alpha + \beta) = \frac{p}{q - 1}$
  • C
    $\sin(\alpha + \beta) = -p$
  • D
    $(a)$ અને $(b)$ બંને

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જો $\cos(\alpha + \beta) = \frac{3}{5}$,$\sin(\alpha - \beta) = \frac{5}{13}$ અને $0 < \alpha, \beta < \frac{\pi}{4}$ હોય,તો $\tan(2\alpha)$ ની કિંમત શોધો.

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$\cos 41^{\circ} \cdot \cos 42^{\circ} \cdot \cos 43^{\circ} \cdot \cos 44^{\circ} \cdot \cos 45^{\circ} \cdot \cos 46^{\circ} \cdot \cos 47^{\circ} \cdot \cos 48^{\circ} \cdot \cos 49^{\circ}$ ની કિંમત શોધો.

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