MCQ
$\cos ^{-1} \frac{4}{5}-\cos ^{-1} \frac{60}{61}=$
- ✓$\cos ^{-1} \frac{273}{305}$
- B$\cos ^{-1} \frac{240}{305}$
- C$\frac{\pi}{2}$
- D$\cos ^{-1} \frac{57}{305}$
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