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Value of cos^(-1) cos(13pi)/(6) is...

Value of `cos^(-1) cos(13pi)/(6)` is

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`cos^(-1)""(cos""(13pi)/(6))`
`=cos^(-1)[cos(2pi+(pi)/(6))]`
`=cos^(-1)(cos""(pi)/(6))=(pi)/(6)`
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Knowledge Check

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    A
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    B
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    C
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    D
    None of these

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