How do you evaluate ${tan}^{- 1} (- 1)$ $tan ^ -1 ( -1)$ ?

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Answer 1 · 2016-10-22T13:30:13

${tan}^{- 1} = - \frac{π}{4}$ $tan^(-1)=-pi/4$

As $tan (\frac{π}{4}) = 1$ $tan(pi/4)=1$ and $tan (- θ) = - tan θ$ $tan(-theta)=-tantheta$

$tan (- \frac{π}{4}) = - 1$ $tan(-pi/4)=-1$

and ${tan}^{- 1} = - \frac{π}{4}$ $tan^(-1)=-pi/4$

How do you evaluate tan ^ -1 ( -1)tan−1(−1) tan ^ -1 ( -1)?