How do you evaluate $arctan (- 1)$ $Arctan (-1)$ ?

1 Answer

Jan 31, 2017

$- 45$ $-45$

Explanation:

Press 1 on calculator then change sign key
$- 1$ $-1$ displayed on screen, now press arctan $= - 45$ $=-45$
On hp9s calculater press "2ndf " then "tan"

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How do you evaluate $arctan (- 1)$ $Arctan (-1)$ ?

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