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Find the principal value of the followin...

Find the principal value of the following
(i) `cos^(-1) (cos 3)` (ii) `cos^(-1) (cos 4)`
(iii) `cos^(-1) (cos 15)` (iv) `cos^(-1) (cos 30)`
(v) `cos^(-1) (cos 50)` (vi) `cos^(-1) (cos.(48pi)/(7))`

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