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Write the value of tan^(-1)(1/x) for x<0...

Write the value of `tan^(-1)(1/x)` for `x<0` in terms of `cot^(-1)(x)` .

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`tan^(-1)(1/x)`
`=tan^(-1)(1/x)` for `x<0`
`=tan^(-1)(1/x)`
`=cot^(-1)x`
`=-(pi-cot^(-1)x)`
`=-pi+cot^(-1)x`
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