The secant lines are the approximations to the tangent line. Geometrically, the limit of the secant lines is the tangent line. The cosine and the secant are even functions; the other trigonometric functions are odd functions. Tangent and secant lines ("standard lines") are represented undistorted. The developable surface may also be either "tangent" or "secant" to the sphere or ellipsoid. It derives from the trigonometric relation (secant) between formula 2 and formula 4. The idea to combine the bisection method with the secant method goes back to . It also appears in connection with the hyperbolic secant distribution. A generalization of the secant method in higher dimensions is Broyden's method. Broyden's method is a generalization of the secant method to more than one dimension. A similar method is used to find the integral of secant cubed. The secant or large-signal inductance is used in flux calculations. This line is a secant or chord of the graph of the function . The infinite line extension of a chord is a secant line, or just "secant". Then the secant formula 220 is parallel to the line formula 187.