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.

  • A
    $10$
  • B
    $15$
  • C
    $20$
  • D
    $25$

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