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26 February, 02:47

What is 2cos (ø) + 1=0

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  1. 26 February, 03:54
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    the cos inverse of - 0.5 is 120

    Step-by-step explanation:

    2cos (ø) + 1=0

    2cos (ø) = -1

    cos (ø) = -1:2

    cos (ø) = -0.5

    dividing both sides by cos

    cos (ø) : cos (ø) = -0.5:cos

    ø=120°
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