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Consider a vertex. Then, Consider a covertex. Then 1324 A • Proofs, Identities, and Toolkit Functions Access for free at openstax.org Let Because then Standard Form of the Hyperbola Derivation A hyperbola is the set of all points in a plane such that the absolute value of the difference of the distances between two fixed points is constant. A • Proofs, Identities, and Toolkit Functions 1325 Diagram 1: The difference of the distances from Point P to the foci is constant: Diagram 2: When the point is a vertex, the difference is Define as a positive number such that 1326 A • Proofs, Identities, and Toolkit Functions Access for free at openstax.org Trigonometric Identities Pythagorean Identities Even-Odd Identities Cofunction Identities Fundamental Identities Sum and Difference Identities Double-Angle Formulas Table A1 A • Proofs, Identities, and Toolkit Functions 1327 Half-Angle Formulas Reduction Formulas Product-to-Sum Formulas Sum-to-Product Formulas Law of Sines Law of Cosines Table A1 1328 A • Proofs, Identities, and Toolkit Functions Access for free at openstax.org