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Math Help - sec (-180)

  1. #1
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    sec (-180)

    ok so i know this would be h/a

    would it be

    a=-1
    b=0
    c=1

    so would the answer be -1 ??? did i do it right
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  2. #2
    o_O
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    \sec (-\pi) = \frac{1}{\cos (-\pi)*} = \frac{1}{\cos \pi *} = ...

    * - \pi is the same position on the unit circle as \pi.
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