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Find the principal value of each of the following: `tan^(-1)(1/(sqrt(3)))` (ii) `tan^(-1)(-1/(sqrt(3)))`

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`tan^(-1)(1/(sqrt(3)))`
`=pi/6`
`tan^(-1)(-1/(sqrt(3)))`
ii) `tan^(-1)(-1/(sqrt(3)))=theta`
`theta= -pi/6`
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