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

1 Answer

Konstantinos Michailidis

Nov 4, 2015

It is

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

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