How do you find the exact value of $arc tan (-sqrt3/3)$ ?

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Answer 1 · 2015-06-09T02:53:36

Find value of $arctan(-sqrt3/3)$

$tan x = ((-sqrt3)/3)$

Trig conversion table gives: arc $x = (5pi)/6$ or 150 deg

How do you find the exact value of arc tan (-sqrt3/3)arc tan (-sqrt3/3)?