Answer
$\cos (- 150)^{\circ}$ = -0.8660
Work Step by Step
Using calculator in degree mode-
(- 150) → $\cos$
$\cos (- 150)^{\circ}$ = -0.8660254038
Rounding it to four places past the decimal point-
$\cos (- 150)^{\circ}$ = -0.8660
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