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11 August, 20:41

Omar was trying to determine cos (-2pi/3). he remembered the ratios of the 30 - 60 - 90 right triangle

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  1. 11 August, 21:05
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    -2/3π=-120°

    Therefore cos (-3/2π) is equal to:

    cos (-120) = cos 120=-cos (180-120)

    but using the right angle triangle:

    cos 60=0.5

    hence

    the value for our question will be:

    cos (-3/2π) = - 0.5
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