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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- Aug 30th 2010, 07:51 PMcurio03secant 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)). - Aug 30th 2010, 08:08 PMEducated
$\displaystyle sec^{-1}(x) = cos^{-1}(\frac{1}{x})$