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Evaluate and simplify cos 2pi/3. The options for answers are in the picture attachment, but I have NO idea how to get any of them? Please, Any help is appreciated (:

Evaluate and simplify cos 2pi/3. The options for answers are in the picture attachment, but I have NO idea how to get any of them? Please, Any help is appreciated (:
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Evaluate and simplify cos 2pi/3. The options for answers are in the picture attachment, but I have NO idea how to get any of them? Please, Any help is appreciated (:

Evaluate and simplify cos 2pi/3. The options for answers are in the picture attachment-example-1
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User Drew Schuster
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7.4k points

1 Answer

1 vote
when pi is inside the trigonometric function you can subs. it by 180 degree
so cos(2*180/3) = cos(120) = -0.5
answered
User Anthony Akentiev
by
8.8k points
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