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How can i the following expression in algebraic form?

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tan(arccos x/3)

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  1. tan[arccos(x/3)]

    (1) Let y = arccos(x/3).

    (2) Take the cosine of both sides.

    (3) Use the identity sec^2(y) - tan^2(y) = 1

    to find tan(y) in terms of cos(y).

    (4) Plug your value for cos(y) into the equation for tan(y).

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