MCQ
If $\cos (\alpha+\beta)=0$, then $\sin (\alpha-\beta)$ can be reduced to
- A$\cos \beta$
- ✓$\cos 2 \beta$
- C$\sin \alpha$
- D$\sin 2 \alpha$
✓
Answer
Correct option: B.
$\cos 2 \beta$
B
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