यदि दो न्यून कोण $A$ और $B$ इस प्रकार हैं कि $A \neq B$ और $\frac{x}{y}=\frac{\cos A}{\cos B}$,तो $\frac{x \tan A-y \tan B}{x+y}=$

  • A
    $\tan \left(\frac{A-B}{2}\right)$
  • B
    $\tan \left(\frac{B-A}{2}\right)$
  • C
    $\tan \left(\frac{A+B}{2}\right)$
  • D
    $\cot \left(\frac{A+B}{2}\right)$

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