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    Mathematics GCSE

    Asymptotes and domain restrictions

    What Asymptotes and domain restrictions means in Mathematics GCSE, as defined for AQA.

    Definition of Asymptotes and domain restrictions

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    Reference: AQA

    The x-axis is a horizontal asymptote for y = kˣ, and y = tan x is undefined at 90°, 270°, etc., where it has vertical asymptotes.
    AQA · Graphs (study guide)

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