यदि $\tan(A + B) = p$ और $\tan(A - B) = q$ है,तो $p$ और $q$ के पदों में $\tan(2A)$ का मान क्या होगा?

  • A
    $\frac{p + q}{p - q}$
  • B
    $\frac{p - q}{1 + pq}$
  • C
    $\frac{p + q}{1 - pq}$
  • D
    $\frac{1 + pq}{1 - p}$

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$\cos^2 \left( \frac{\pi}{6} + \theta \right) - \sin^2 \left( \frac{\pi}{6} - \theta \right) = $

यदि $\cos \theta = \frac{3}{5}$ और $\cos \phi = \frac{4}{5}$ है,जहाँ $\theta$ और $\phi$ धनात्मक न्यून कोण हैं,तो $\cos \frac{\theta - \phi}{2} = $

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