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Find the principal value of: tan^(-1)(-1...

Find the principal value of: `tan^(-1)(-1)`

Text Solution

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Let `tan^(−1)(−1)=θ`
`⇒tanθ=−1`
`⇒tanθ=-tan (pi/4)` ​
`=>tanθ=tan(− pi/4)` ...
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