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Math Help - secant inverse in terms of cosine inverse?

  1. #1
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    secant inverse in terms of cosine inverse?

    What does sec^-1(x) (secant inverse) equal in terms of cos^-1(x) (cosine inverse)?

    I know that sec^-1(x) is not equal to 1/(cos^-1(x)).
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  2. #2
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    sec^{-1}(x) = cos^{-1}(\frac{1}{x})
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