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2 August, 02:27

What is the value of cos-1 (-1/2)

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  1. 2 August, 04:26
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    120 degrees or 2 pi/3

    Step-by-step explanation:

    cos ^ - 1 (-1/2)

    Using the unit circle, we look for the x value of - 1/2. Cos is the x value, sin is the y value. We find - 1/2 at 120 degrees or 2 pi/3
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