+A **real differentiable** function is one whose graph possesses a distinct [tangent line](/wiki/tangent_line) at every point. This property means its [derivative](/wiki/derivative) exists across its domain, indicating a smooth, unbroken curve and guaranteeing [continuity](/wiki/continuity).
+## See also
+- [Derivative](/wiki/derivative)
+- [Real Function](/wiki/real_function)
+- [Continuity](/wiki/continuity)
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