MCQ
$\frac{1-\tan ^2 45^{\circ}}{1+\tan ^2 45^{\circ}}$ is equal to
- A$\tan 90^{\circ}$
- B1
- C$\sin 45^{\circ}$
- ✓$\sin 0^{\circ}$
✓
Answer
Correct option: D.
$\sin 0^{\circ}$
D
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