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Find the principal values of cot^(-1)sqr...

Find the principal values of `cot^(-1)sqrt(3)` and `cot^(-1)(-1)`

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(i)Let `cot^(-1)sqrt(3)`=y
`=>coty=3`
`​=cot(π/6​).`
Therefore, the principal value of `cot^(-1)sqrt(3)` is `π/6​.`
(ii)As `cot^(-1)(-1)` `x∈[0,π]`
Hence`cot^(-1)(-1)``=(3π)/4`​
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