Hyperbola: director circle (Locus of intersection of perpendicular tangents (real locus only if a² >)

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Locus of intersection of perpendicular tangents (real locus only if a² > b²)

What each symbol means

SymbolWhat it stands for
a, bHyperbola parameters

When to use this

For x²/a² − y²/b² = 1 with a > b so that a² − b² > 0.