MCQ
${\cos ^{ - 1}}\left( {\cos \frac{{5\pi }}{3}} \right) + {\sin ^{ - 1}}\left( {\cos \frac{{5\pi }}{3}} \right) =\ ..... . .$
  • $\frac{\pi }{2}$
  • B
    $\frac{{5\pi }}{3}$
  • C
    $\frac{{10\pi }}{3}$
  • D
    $0$

Answer

Correct option: A.
$\frac{\pi }{2}$
${\cos ^{ - 1}}\left[ {\cos \frac{{5\pi }}{3}} \right] + {\sin ^{ - 1}}\left[ {\frac{{\cos 5\pi }}{3}} \right] = \frac{\pi }{2}\ (\because$ ${\sin ^{ - 1}}x + {\cos ^{ - 1}}x = \frac{\pi }{2}).$

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