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Answer:
-2 sqrt (2) /3
Step-by-step explanation:
sin = -1/3 its in the 3rd quadrant so sin is negative cos is negative
sin^2 O + cos ^2 O = 1
1 - (1/9) = cos^2 O
[tex] \cos( \alpha ) = \frac{ - 2 \sqrt{2} }{3} [/tex]