यदि $\cos (\alpha + \beta) = \frac{3}{5}$,$\sin (\alpha - \beta) = \frac{5}{13}$ और $0 < \alpha, \beta < \frac{\pi}{4}$ है,तो $\tan (2\alpha)$ का मान ज्ञात कीजिए।

  • A
    $\frac{63}{52}$
  • B
    $\frac{33}{52}$
  • C
    $\frac{63}{16}$
  • D
    $\frac{21}{16}$

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यदि $\sin A = n \sin B$ है,तो $\frac{n - 1}{n + 1} \tan \frac{A + B}{2} = $

यदि $\tan A = \frac{5}{6}$ और $\tan B = \frac{1}{11}$ है,तो $A + B = $

यदि $\sin A = \frac{1}{\sqrt{10}}$ और $\sin B = \frac{1}{\sqrt{5}}$,जहाँ $A$ और $B$ धनात्मक न्यून कोण हैं,तो $A + B = $

मान ज्ञात कीजिए: $\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma )$

$\cos^2 48^{\circ} - \sin^2 12^{\circ}$ का मान ज्ञात कीजिए,यदि $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ है।

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