જો $\frac{1-\tan \theta}{1+\tan \theta}=\frac{1}{\sqrt{3}}$,જ્યાં $\theta \in \left(0, \frac{\pi}{2}\right)$,તો $\theta=$

  • A
    $\frac{\pi}{12}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{6}$
  • D
    $\frac{\pi}{3}$

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ધારો કે $\cos(\alpha+\beta)=-\frac{1}{10}$ અને $\sin(\alpha-\beta)=\frac{3}{8}$ જ્યાં $0 < \alpha < \frac{\pi}{3}$ અને $0 < \beta < \frac{\pi}{4}$. જો $\tan 2\alpha=\frac{3(1-r\sqrt{5})}{\sqrt{11}(s+\sqrt{5})}$, જ્યાં $r, s \in N$, તો $r+s$ ની કિંમત . . . . . . થાય.

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