જો $\cos x + \cos y = \frac{2}{3}$ અને $\sin x - \sin y = \frac{3}{4}$ હોય,તો $\sin(x - y) + \cos(x - y)$ ની કિંમત શોધો.

  • A
    $\frac{161}{145}$
  • B
    $\frac{127}{145}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{8}{9}$

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$\operatorname{Tanh}^{-1}\left(\frac{1}{3}\right)+\operatorname{Coth}^{-1}(3)=$

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