MCQ
If $(\sec \theta-1)(\sec \theta+1)=\frac{1}{3}$, then $\cos \theta=$ _____
- A$\frac{1}{2}$
- B$\frac{1}{\sqrt{2}}$
- ✓$\frac{\sqrt{3}}{2}$
- D$\frac{\sqrt{2}}{3}$
✓
Answer
Correct option: C.
$\frac{\sqrt{3}}{2}$
$\frac{\sqrt{3}}{2}$
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