MCQ
$\frac{{{(\cos \alpha +i\,\sin \alpha )}^{4}}}{{{(\sin \beta +i\,\cos \beta )}^{5}}}=$ [RPET 2002]
- A$\cos (4\alpha +5\beta )+i\,\sin (4\alpha +5\beta )$
- B$\cos (4\alpha +5\beta )-i\,\sin (4\alpha +5\beta )$
- ✓$\sin (4\alpha +5\beta )-i\cos (4\alpha +5\beta )$
- DNone of these