How do you calculate $arctan (- \frac{1}{2})$ $arctan(-1/2)$ ?

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Answer 1 · 2015-05-21T05:17:40

tan x = -1/2. Find x.

Calculator gives x = -26.27 deg

Trig unit circle gives another arc x that has same tan value:

x = -26.27 + 180 = 153.43

How do you calculate arctan(−12)arctan(-1/2)?