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| a formula for determining additional values or derivatives of a function from the relationship of its given values |
| a function having the dependent variable expressed directly in terms of the independent variables, such as y = 3x + 4 |
orthogonal trajectory
family of curves that intersect another family of curves at right angles (orthogonal; see ). Such families of mutually orthogonal curves occur in such branches of physics as electrostatics, in which the lines of force and the lines of constant potential are orthogonal; and in hydrodynamics, in which the streamlines and the lines of constant velocity are orthogonal
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