$\frac{(\cos \alpha + i\sin \alpha )^4}{(\sin \beta + i\cos \beta )^5} = $

  • A
    $\cos (4\alpha + 5\beta ) + i\sin (4\alpha + 5\beta )$
  • B
    $\cos (4\alpha + 5\beta ) - i\sin (4\alpha + 5\beta )$
  • C
    $\sin (4\alpha + 5\beta ) - i\cos (4\alpha + 5\beta )$
  • D
    इनमें से कोई नहीं

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