यदि $\tan \theta = \frac{\sin \alpha - \cos \alpha}{\sin \alpha + \cos \alpha}$ और $0 \leq \alpha \leq \frac{\pi}{2}$ है,तो $\cos 2 \theta$ का मान क्या है?

  • A
    $\cos 2 \alpha$
  • B
    $\sin \alpha$
  • C
    $\cos \alpha$
  • D
    $\sin 2 \alpha$

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यदि $\cot \alpha = \frac{1}{2}$ और $\sec \beta = -\frac{5}{3}$,जहाँ $\alpha \in \left(\pi, \frac{3\pi}{2}\right)$ और $\beta \in \left(\frac{\pi}{2}, \pi\right)$ है,तो $\tan(\alpha + \beta)$ का मान ज्ञात कीजिए।

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