${\left( \frac{\cos A + \cos B}{\sin A - \sin B} \right)^n} + {\left( \frac{\sin A + \sin B}{\cos A - \cos B} \right)^n}$ ($n$ एक पूर्णांक है) $=$

  • A
    $0$
  • B
    $2 \cot^n \left( \frac{A - B}{2} \right)$
  • C
    यदि $n$ विषम है तो $0$,यदि $n$ सम है तो $2 \cot^n \left( \frac{A - B}{2} \right)$
  • D
    इनमें से कोई नहीं

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