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17 September, 10:47

What is the cosine of negative five pi over six?

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  1. 17 September, 13:37
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    Cosine has a period of 2pi. So

    cos (-5pi/6)

    =cos (-5pi/6+2pi)

    =cos (7pi/6)

    =-cos (7pi/6-pi)

    =-cos (pi/6)

    =-sqrt (3) / 2

    Note that each step has a justification, but we are not allowed to give u r l references, so cannot provide you with more information.
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