જો $\operatorname{cosec}^2(\alpha+\beta)-\sin^2(\beta-\alpha)+\sin^2(2\alpha-\beta)=\cos^2(\alpha-\beta)$ જ્યાં $\alpha, \beta \in (0, \frac{\pi}{2})$ હોય,તો $\sin(\alpha-\beta)$ ની કિંમત શોધો.

  • A
    $-\frac{1}{2}$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{\sqrt{3}}{2}$
  • D
    $\frac{\sqrt{3}}{2}$

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