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4 August, 03:59

Given that cosine theta = - 1/2 and theta is obtuse find sin4theta

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  1. 4 August, 04:32
    0
    0.8660

    Step-by-step explanation:

    cosine theta = - 1/2

    theta = cosinearctan (-0.5)

    theta = 120

    sine4theta = sine 4 (120)

    = sine480

    = 0.8660
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