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Find the value of the following: cos^(-1...

Find the value of the following: `cos^(-1)(cos""(13pi)/6)`

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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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