MCQ
$\tan \left[\left(\cos ^{-1}\left(\frac{-2}{7}\right)-\frac{\pi}{2}\right)\right]=$_______.
- ✓$\frac{2}{3 \sqrt{5}}$
- B$\frac{2}{3}$
- C$\frac{1}{\sqrt{5}}$
- D$\frac{4}{\sqrt{5}}$
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