MCQ
If $2 \sin ^2 \beta-\cos ^2 \beta=2$, then $\beta$ is equal to
- A$0^{\circ}$
- ✓$90^{\circ}$
- C$45^{\circ}$
- D$30^{\circ}$
✓
Answer
Correct option: B.
$90^{\circ}$
B
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