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12th grade

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if cos Q=5/9, find 5/9

  • 12th grade -

    5/9

    arccos 5/9 is quite another thing, it is equal to 56.25 deg

  • 12th grade -

    cos(Q)=5/9
    cos inverse both sides
    cos^-1(cos(Q))=cos^-1(5/9)
    cos^-1(cos(Q))=Q, based on inverse properity

    Q=cos^-1(5/9)

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