मान लीजिए $\tan \alpha = \frac{a}{a+1}$ और $\tan \beta = \frac{1}{2a+1}$, तो $\alpha + \beta$ का मान क्या है?

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{\pi}{3}$
  • C
    $\frac{\pi}{2}$
  • D
    $\pi$

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$\cos \alpha \sin (\beta-\gamma) + \cos \beta \sin (\gamma-\alpha) + \cos \gamma \sin (\alpha-\beta)$ का मान क्या है?

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यदि $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ और $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$ है,तो:

यदि $\cos (\theta+\phi)=\frac{3}{5}$ और $\sin (\theta-\phi)=\frac{5}{13}$, जहाँ $0 < \theta, \phi < \frac{\pi}{4}$, तो $\cot (2 \theta)$ का मान ज्ञात कीजिए:

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