# Common Point of Tangents

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This Demonstration shows that all tangents on a one-parameter family of functions at a fixed go through some fixed point. In particular, it is true for parabolas .

Contributed by: Izidor Hafner (May 2013)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

All tangents on the graph of the general solution of an ordinary linear differential equation of the first order at a fixed have common point or are parallel. The general solution has form .

Reference

[1] V. I. Smirnoff, *Lectures in Higher Mathematics* (in Russian), Vol. II, Moscow: Nauka Publishers, 1967 p. 25.

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