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2 July, 03:31

Which expression is equivalent to cos 120°?

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  1. 2 July, 03:51
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    cos 120° = - 1/2

    Step-by-step explanation:

    cos 120° = (adjacent side) / (hypotenuse.

    Here the adjacent side (the side next to the central angle in this 30-60-90 triangle) is - 1. Then the hypotenuse is 2 and the opposite side is √3.

    Thus, cos 120° = - 1/2
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