${\left( {\frac{{\cos A + \cos B}}{{\sin A - \sin B}}} \right)^n} + {\left( {\frac{{\sin A + \sin B}}{{\cos A - \cos B}}} \right)^n}$ ($n$ એકી કે બેકી છે) $=$

  • A
    $0$
  • B
    $2 \cot^n \left( \frac{A - B}{2} \right)$
  • C
    જો $n$ એકી હોય તો $0$,જો $n$ બેકી હોય તો $2 \cot^n \left( \frac{A - B}{2} \right)$
  • D
    આમાંથી કોઈ નહીં

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