જો $\cos (\theta+\phi)=\frac{3}{5}$ અને $\sin (\theta-\phi)=\frac{5}{13}$, જ્યાં $0 < \theta, \phi < \frac{\pi}{4}$, તો $\cot (2 \theta)$ ની કિંમત શોધો:

  • A
    $\frac{16}{63}$
  • B
    $\frac{63}{16}$
  • C
    $\frac{3}{13}$
  • D
    $\frac{13}{3}$

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