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Find the minimum value of n for which t...

Find the minimum value of `n` for which `tan^(-1)(n/pi)>pi/4,n in Ndot`

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`tan^(-1) frac{n}{pi}>frac{pi}{4}`
`frac{n}{pi}> tan frac{pi}{4}`
`n>pi`
Then the min value of `n` is `4`
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  13. Find the set of values of sec^(-1)((sqrt(3))/2)

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  14. Find the principal values of sec^(-1)(2/(sqrt(3))) and sec^(-1)(-2)

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