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cos[cos^(-1)((-1)/(7))+sin^(-1)((-1)/(7)...

`cos[cos^(-1)((-1)/(7))+sin^(-1)((-1)/(7))]`=

A

(A) `-1/3`

B

(B) 0

C

(C) `1/3`

D

(D) `4/9`

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